This was a lot of fun. The Speed boats are 15ft fibreglass two-seaters with 25 HP 2-stroke outboards. They go fast enough that you can catch some air on a big wave (if you choose). The tour starts with a 20 minute ride to the beach and about 20 minutes of prep and orientation. The group takes off the the beach and stops in front of one of the resorts (I think Coral Princess or nearby) for a short bit of snorkelling. Shore snorkelling isn't great in Cozumel since the hurricane a few years ago and the current is strong so you have to stay close to the shore, but it's a destination for the boats and still fun. The staff are diligent about keeping track of everyone. After snorkelling you rip around in the boats for a while longer. Altogether about 1.5 hours with boating and snorkelling. After the tour you spend about an hour at the beach where you can buy lunch, photos, drinks and the tour guide gives a demonstration on making Mexican salsa. The chips and salsa are free but everything else costs. Be sure to bring a few bucks for a locker ($3) at a minimum.
We did a snorkeling tour that included a trip to the USS Kittewake, a purposely sunken US Navy rescue ship, followed by a short trip to Cheeseburger Reef near to the cruise port.
The boat was a large catamaran with plenty of room for the the 30 participants to move around comfortably. The equipment was in good shape. They played an audio history of the wreck along the way so you knew all about the ship by the time we got there. We had a lot of time at the wreck. The ship sits in about 60 ft of water and is about 15 feet form the surface at it's highest point. Although you wouldn't know it since the water is so clear. We could see groups of stingrays cruising by on the bottom and plenty of schools of fish swimming around. If you are an experienced snorkeller you can easily dive down to touch the boat or look in some windows. For beginners it is a unique experience to see a real-life intact "wreck". Cheeseburger reef is also a good snorkel in a shallow reef with plenty of fish and coral to look at. The reef is close the the port and the moored cruise ships which makes for an interesting scene above the surface as well.