Snorkeling allows you to pretend you’re something you’re not, such as a fish, a shark, or a person who knows how to snorkel. Dive into a new identity with today’s Groupon: for $42, you get the Dolphin Adventure and Snorkeling by Boat excursion from Catalina Divers Supply in Avalon (an $85 value).

During a 2.5-hour Dolphin Adventure, experienced guides lead snorkel-breathing sightseers through glittering deep-sea waters teeming with aquatic life. As the group glides toward the dive site aboard the 46-foot Scuba Cat, a custom-built dive boat, guests can employ the ship’s two camera tables to play paparazzi with dolphins, sea lions, and whales or let marine biologist and maritime manager Captain Carl regale them with sea-creature trivia, such as the name of Moby Dick's pet goldfish. At their destination, they'll disembark via wide-stepped ladders that skim the water’s surface to ease snorkelers' entry into the deep blue. Then, trailing an experienced guide, they'll penetrate the inner sanctum of a leafy kelp forest to feast their eyes upon lobsters, fish, and confused lumberjacks.

On the return journey aboard the Scuba Cat, voyagers can enjoy complimentary en route refreshments as they absorb solar energy on the sundeck. Pack light, since Catalina Divers Supply outfits all customers with the necessary snorkeling gear, with the exception of a swimsuit, towel, and siren-deterring earplugs.