RCCL : the winter 2015-16 season are now open for sale to the "Big four"

The world’s largest and most innovative sister-ships Allure of the Seas and Oasis of the Seas will offer vacationers still-matched Caribbean cruises in the 2015-16 winter season.

Both ships will homeport at Port Everglades in Fort Lauderdale, Fla. and alternate a seven-night Eastern and Western Caribbean itineraries.

Eastern Caribbean ports of call include Nassau, The Bahamas, St. Thomas and St. Maarten, while Western Caribbean ports include Falmouth, Jamaica; Cozumel, Mexico; and Labadee, Royal Caribbean’s private beach paradise on the north coast of Haiti.

Oasis of the Seas and Allure of the Seas individually offer the widest array of onboard amenities of any ship in the industry. The ships seven themed neighborhoods that exclusively offer a zip line, a park open to the skies with more than 12,000 plants and trees, a handcrafted carousel, and an Aquatheater for high-diving, aerial-acrobatic productions.

Freedom of the Seas will continue its seventh consecutive year sailing from Port Canaveral along Florida’s Space Coast, alternating seven-night Eastern and Western Caribbean itineraries.

The Eastern Caribbean itinerary calls at St. Thomas, St. Maarten and CocoCay, Royal Caribbean’s private Bahamian-island paradise. The Western Caribbean itinerary calls at Grand Cayman, Falmouth, Cozumel and Labadee.

For its part, Serenade of the Seas will sail a 10- and 11-night Southern Caribbean itineraries, roundtrip from Port Everglades. The 10-night itinerary calls at Tortola, St. Kitts, Dominica, Antigua and St. Maarten, with the Dec. 4, 2015, and Feb. 26, 2016, sailings replacing Dominica with Martinique.

On the 11-night itinerary, guests will call at Aruba, Antigua, Barbados, Bonaire, Grenada and St. Lucia. A special 12-night holiday sailing includes all the ports from the 11-night itinerary, plus calls at St. Thomas and Labadee.

And a once-only, nine-night itinerary will call at the Aruba, Bonaire, Curacao and Key West, Fla.