Sea Excursions

The most impressive sights in the Cayman Islands are on and under water, and several submarines, semisubmersibles, glass-bottom boats, and Jules Verne–like contraptions allow you to see these underwater wonders without getting your feet wet. Sunset sails, dinner cruises, and other theme (dance, booze, pirate) cruises are available from $35–$90 per person.

Nautilus. On this semisubmersible you can sit above deck or venture below, where you can view the reefs and marine life through a sturdy glass hull. A one-hour undersea tour is $60. Watch divers feed the fish, or take the Captain's Nemo's Tour that includes snorkeling; a catamaran cruise to Stingray City and land-sea tours are also offered. 93 N. Church St., George Town, Grand Cayman, KY1-1001. 345/945–1355.

Sea Trek. Helmet diving lets you walk and breathe 26 feet underwater for an hour—without getting your hair wet. No training or even swimming ability is required (ages eight and up), and you can wear glasses. Guides give a thorough safety briefing, and a sophisticated system of compressors and cylinders provides triple the amount of air necessary for normal breathing while a safety diver program ensures four levels of backup. The result at near-zero gravity resembles an exhilarating moonwalk ($89). Cayman Cabana, 53 N. Church St., George Town, Grand Cayman, KY1-1109. 345/949–0008; www.seatrekcayman.com, www.snubacayman.com.