You never know when events beyond your control will mess with or even ruin your cruise vacation. That's why Cruise Critic typically recommends buying a travel insurance policy to protect your vacation investment. But the world of insurance is full of mind-numbing fine print that most cruisers skip past -- until they try to make a claim and discover they're not covered by their policy.

What does travel insurance not cover? Many common cruise mishaps -- from missing the ship to wanting to cancel for personal safety -- are actually travel insurance exclusions, meaning you won't be reimbursed for your financial losses.

Before you pay for that policy, make sure you know what is actually included, or not, in your plan. Here are 10 surprising things travel insurance will not cover on your cruise.

1. A Trip the Cruise Line Cancels

Just because your cruise line cancels your sailing does not mean that travel insurance will reimburse you for any additional trip expenses -- airfare, hotel, tours, etc. -- you can't recoup. "If a cruise line cancels out of nowhere," says Meghan Walch, product manager at travel insurance aggregator InsureMyTrip, "you might not be covered."

She adds that some policies will cover cancellations due to the mechanical failure of a common carrier (such as an airplane or cruise ship) or if weather causes the "complete cessation" of operations.

For example, if you're booked on the inaugural voyage of a new cruise ship, and the cruise line decides the ship isn't ready for guests and cancels, your travel insurance policy might not cover your nonrefundable airfare to your homeport. However, Walch suggests always checking with your travel provider; they might let you rebook your travel. In the case of the coronavirus epidemic with many cruise lines canceling sailings at the last minute, travel providers are more willing to work with cruisers to offer refunds or rebooking.

2. Your Designer Cruise Wear

Comprehensive travel insurance policies offer coverage for lost or stolen baggage; however, the coverages have limits, both per trip and per article for specific items like electronics and jewelry. (Plus, some electronics aren't covered at all.) If your suitcase is filled with a week's worth of designer duds, and the airline sends it to Timbuktu or a clumsy porter drops it in the water, your travel insurance might not reimburse you for the full value of your lost belongings.

If you do plan on taking expensive clothing and jewelry on your luxury cruise, consider listing those items on your homeowner's policy, which might cover items lost, damaged or stolen while traveling. And look for a travel insurance policy with higher lost luggage limits. Finally, you might want to take photos of the special items you pack to prove what was lost in case something goes wrong.

3. Scuba Diving and Parasailing Excursions

Scuba Diving (Photo: Jukkis/Shutterstock)

If active and adventurous pursuits are part of your port day plan, be aware that standard travel insurance policies do not cover injuries related to adventurous, dangerous or extreme activities. These can include typical cruise ship shore excursions, such as parasailing and scuba diving. If you get injured while diving and need to seek medical attention in a foreign country, your insurance provider is likely to reject your claim for reimbursement.

However, many plans offer a rider, or add-on to your base policy, to cover more extreme activities. You'll want to pay for one of these if you plan on booking a thrilling excursion in port.

4. Cancellation Due to CDC or Government Warning

Say the State Department issues a travel warning for your cruise destination, or the CDC is cautioning travelers not to cruise during a pandemic. If you think, "I'll be safe, take their advice and cancel my paid-in-full cruise," you might be in for a surprise because your travel insurance provider won't reimburse you for cancellations due to travel warnings.

Walch says, "Some plans may offer coverage due to CDC warnings, but typically you'd have to purchase the plan before the warning is announced -- and very few plans offer that coverage."

5. A Cruise Bought With Points

Frequent flyers and savvy shoppers who hoard miles and points can actually save enough to get a "free" cruise, paid for with virtual currency. Just don't think you can insure a trip booked that way the same way you insure a paid-with-cash trip.

"You can't place a monetary value on points, and then insure your trip for that amount," says Walch, "but you can insure any associated fees." For example, if your cruise is valued at $2,500, but you paid with points and $100 in fees, you can only insure your trip for \$100 and get reimbursed based on that amount -- not its $2,500 value.

However, that doesn't mean you should skip insurance. You'll still get coverage for medical emergencies or lost luggage, and the insurance might reimburse you for fees associated with rebanking your points should you cancel for a covered reason.

6. Missing the Ship in Port

What to Do If Your Cruise Ship Leaves You Behind and How to Prepare So It Doesn't Happen to You (Photo: Samot/Shutterstock.com)

If you forget to set your watch to ship's time, get drunk at Margaritaville and lose track of time, or get stuck in traffic coming back from a far-flung private shore excursion and miss your ship, travel insurance will not pay for your flight to the next port or your hotel for the night. Missing embarkation and getting left behind is not a covered situation for travel insurance, no matter how good your excuse is.

(Injuries or losses due to intoxication are never covered, so if you drink too much and hurt yourself, and the medical records acknowledge that, your policy won't reimburse you for medical expenses.)

7. Death or Illness of a Beloved Pet

If Fluffy gets diagnosed with a tumor -- or worse, dies -- the week before your cruise, we'd understand if you wanted to cancel your trip. However, while travel insurance will typically reimburse you if the same were true of a human in your family, most policies don't extend the coverage to pets.

However, if your dearest family members have four legs, you can purchase add-on coverage to certain policies that will cover you for trip cancellation or interruption due to the death or critical condition of a pet.

8. Civil Unrest in a Cruise Port

Venice, Italy. 29th November, 2019. Youngsters take part in "Fridays for future" demonstration, a worldwide climate strike against governmental inaction towards climate breakdown and environmental  (Photo: Stefano Mazzola/Shutterstock)

When riots or protests are taking place in your embarkation port city, or the transportation sector is striking and you're not sure you can get from the airport to the cruise port, you might decide the best course of action is to cancel and rebook your cruise.

Unfortunately, your travel insurance policy won't reimburse you for canceling due to civil unrest. You'll need to brave the chaos -- or eat your vacation investment. As with other governmental warnings or general discomfort with a travel situation, you won't be covered for canceling out of concern or fear. (On the other hand, many policies will reimburse you if terrorism prevents you from taking or interrupts your trip.)

9. Dental Care

Most travel insurance policies offer limited dental coverage -- but might not deem something you consider an emergency as an essential issue. "Some dental coverage, included with medical, will cover you if you have an accident or injury to a natural tooth," says Walch. Though, as with medical, there will be an upper limit on how much you'll be reimbursed for emergency dental treatment.

Travel insurance won't cover the loss of or damage to dental bridges or implants, braces, dentures or mouth guards. Some plans might not cover problems with your natural teeth if they did not result from an accident or injury. (Also, if you get your teeth whitened at the onboard spa and then find out you can't eat and drink what you want for a day or two because your teeth are sensitive -- travel insurance won't make you whole for that, either.)

10. Procrastination

Concerned couple planning a trip (Photo: Antonio Guillem/Shutterstock)

With travel insurance, there's a time for everything. Miss the window and you miss out. For example, if you want to purchase a cancel-for-any-reason add-on policy or be covered for pre-existing conditions, you must purchase your policy within a few weeks of making the first deposit on your trip. Procrastinate buying insurance, and you'll become ineligible for these coverages.

Same thing with making a claim. "All policies have wording governing how long you have to file a claim, some might be days, months or a year," says Walch. "The time frame varies widely and also can vary depending on which state you live in." She recommends filing right away, both to make sure you don't miss the claim window but also because the information needed for the claim is still fresh in your mind with all the receipts available and not lost.