Like humans, marine mammals—including dolphins, clams, and jellyfish—used to scuba dive for underwater transportation until they moved on to manatee-driven chariots. Explore water's depths the old-fashioned way with today's Groupon: for $35, you get the PADI Discover Scuba Diving course at Annapolis Scuba Center (a $135 value).
After strapping on a provided underwater tuxedo, Annapolis Scuba Center's PADI-certified scuba instructors and divemasters will lead students through the shallow waters of an indoor pool, acquainting them with the basics and equipment essential to exploring the ocean deep. Once participants feel comfortable and have grown a rudimentary set of gills, they will go into the deep end for further teaching, where they'll learn more advanced aquatic maneuvers and ask common questions, such as why octopi always get stuck playing the xylophone in undersea musical numbers. Sessions are currently scheduled at 1 p.m. and 3 p.m. on select weekends in October and November.