Seven Seas Mariner pool deck

(11 a.m. EDT) -- In 2020, Regent's Seven Seas Mariner will take over world cruise duties from sister ship Navigator (slated to host the 2018 and 2019 around-the-world voyages).

Seven Seas Mariner's 131-night cruise, which departs January 24, 2020, will sail roundtrip from San Francisco (with an option to sail roundtrip from Miami on January 6 instead). The 700-passenger ship is scheduled for dry dock spring 2018.

The 2020 world cruise will visit 66 ports in 30 countries on six continents. There will be 13 overnight port stops, and passengers have the opportunity to visit 36 UNESCO World Heritage Sites. The itinerary includes the South Pacific, India, the Arabian Peninsula, Mediterranean, Caribbean and Central America. Seven Seas Mariner returns to San Francisco on June 4, 2020.

Full World Cruise passengers are entitled to numerous perks. These include the ability to select excursions from a list of 330 complimentary tours, and invitations to all to three special shoreside events: a Lord of the Rings-themed dinner in the Auckland War.

Museum, a dinner and cultural show in Singapore's Gardens by the Bay and an event at a 13th-century Tuscan estate that includes a tour of the villa's wine cellar and fine art collection followed by a farm-to-table dinner and a Renaissance-themed performance.

World Cruise passengers embarking in San Franciso will be treated to a dinner of California cuisine at the Ritz-Carlton.

Regent also offers full World Cruise passengers free roundtrip first-class airfare, unlimited laundry and pressing, luggage service, a visa package and onboard medical care. These are in addition to standard Regent perks for all passengers: complimentary Wi-Fi, beverages, specialty restaurant meals, gratuities and airport transfers.

Passengers also have the option of booking one- to three-night overland tours, for which they'd debark the ship for a few nights to explore inland. Overland excursions include a visit to Angkor Wat in Cambodia from Bali, a Taj Mahal trip from Cochin, and a tour of Egyptian pyramids from Luxor.

Both roundtrip San Francisco and Miami world cruises open for bookings July 20, 2017. Fares start at $64,999 for a veranda suite.

--By Erica Silverstein, Senior Editor