Aboard the Atlantis Submarine, you get a diver’s-eye view without having to get wet or learn to scuba. The recreational sub cruises the outer Chankanaab Reef, descending to depths of 100 feet. You’ll gaze out your porthole at colorful coral, schools of tropical fish and maybe even a sea turtle floating by. A ferry transports you to the submarine. The sub bobs for several minutes as passengers board — the only part of the journey that got us a bit queasy. Take precautions with kids (and adults) prone to sea sickness. Children must be at least 36 inches tall to board. Reserve ahead, as this outing is popular with cruisers.