A turtle's shell protects it from the claws of predators, the hands of wayward children, and the wandering eyes of loan sharks. Marvel at evolutionary wisdom with today's Groupon: for $95, you get a 20-minute submersible-scooter ride and a 90-minute turtle-watching experience from Island Watersports Hawaii (a $198 value).

Island Watersports Hawaii engineers astonishing aquatic adventures in magnificent Maunalua Bay. Enjoy a new kind of ocean view or jet around the campus of underwater college, with a ride on a self-propelled submersible scooter. Like a motorized human fishbowl, the scooters allow underseafarers an up-close experience with marine life without a mouthful of breathing apparatus. After arriving at the dive site on Island Watersports Hawaii's 40-foot dive boat, gracious guides lead adventurers through an orientation before diving underseas on the earth-friendly electric scooters for a 20-minute tour of the regal reefs, pointing out flashy fish, colorful coral, and yoga-mat-impersonating manta rays along the way. Once back on deck, the dive boat delivers a 90-minute turtle-watching tour, replete with multiple sightings of Hawaii's illustrious and wise green sea turtles. Passengers can also enjoy other oceanic activities, such as swimming and snorkeling in the sea, sunbathing on the expansive deck, or picking fresh sea salt from mid-ocean reserves. The boat also makes its way past the Hawaii Five-0 filming grounds and provides a light snack for guests.

Since self-splashing is inevitable when underwater, passengers should tuck a swimsuit, towel, and waterproof sunscreen into their tote bags.