Atlantis Submarines. This is the underwater adventure for the unadventurous. Not fond of swimming, but want to see what you've been missing? Board this high-tech 64-passenger vessel for a ride past shipwrecks, turtle breeding grounds, and coral reefs. The tours, which depart from the pier at the Hilton Hawaiian Village, are available in several languages. A smaller 48-passenger semisubmersible boat with underwater viewing windows is a bit cheaper than the submarine trip. (Discounts are available if booked online.) Hilton Hawaiian Village Beach Resort & Spa, 2005 Kalia Rd., Honolulu, Hawaii, 96815. 808/973–9800; 800/381–0237; www.atlantisadventures.com. From $119.