Keen to frolic between all the tropical Caribbean isles that make up the US Virgin Islands? The Westin St. John Resort has just launched a unique new service that lets you do exactly that. Coordinated by a Boating Butler, the "Island Hopper Experience" lets adventurous guests explore the open waters with personalized boating adventures-- from St. John to St. Thomas to St. Croix and back. Book a five-night "Island Hopper Experience" and you'll receive a resort credit of $150 that can be applied at time of checkout towards boat rentals. Stays of six nights or greater receive a $200 resort credit. Choose between the following:* For the whimsical wanderluster : Catamaran Island Spirit"Island Spirit" is a brand new custom built sailing catamaran, the first of its kind in the U.S. Virgin Islands, the vessel can accommodate up to 70 passengers. The cabin features a large U shaped bar for beverage and food service, upholstered seating in both sun or shaded areas, and stereo throughout the vessel.* For the family frolicker: Dinghy boat rentalBe your own captain aboard a 12 foot dinghy powered by a 15 hp Yamaha outboard. Take a picnic lunch and cruise the U.S. Virgin Islands at your own pace. Visit stunning beaches like, Honeymoon, Caneel, Hawksnest and Trunk Bay.* For the adventurous explorer: Powerboat Rentals with Nauti NymphFountain Powerboats offer simplified elegance teamed up with the highest quality and best performance. The vessel makes for one of the smoothest riding, best handling and safest boats in its class.* For the sophisticated traveler: Luxury Excursion with Magic MomentsMagic Moments Luxury Excursions caters to guests who want to discover the heights of luxury at sea level. Offering first class service and gourmet food and drink aboard a luxury yacht, guests are pampered with breathtaking destinations in the U.S. Virgin Islands.* For the underwater voyager: Cruz Bay Watersports Diving ExperienceScuba diving around St. John is best described as fantastic, safe, easy and fun. Divers can discover more than 25 under water sites within a 15 minute boat ride. Shallow coral gardens, shear rock faces, and fringing coal reefs have an outstanding variety of hard and soft corals, sea fans and sponges of every hue. Visibility ranges from 50-100 feet, and water temperature between 78-84 degrees.The offer is available for stays booked now through December 30, 2010, and is subject to availability. An "Island Hopper Experience" of at least five nights includes one free night, and also a complimentary upgrade based on availability.