Bodies of water are frequent metaphors in poetry, perhaps due to their unfathomable depths, unknowable sprawl, and unattainable porpoises. Get a little closer to the world's wettest enigmas with today's Groupon: for $95, you get your choice of a two-hour sailing lesson or a two-hour leisure cruise in the harbor for three people with Courageous Sailing in Charlestown, a $190 value.

For two hours, the sea-curious get to try their hand at sailing the Boston Harbor amid the billowing sails and ocean spume of a small boat such as the Rhodes 19—a 19-foot-long sailboat perfectly sized for up to three students looking to grow a pair of sea legs and one skipper brave and sure who will bail you out in the event of any kraken encounters. If you have some sailing experience, simply give notice of the specific area you'd like to focus on while making your reservation. And if you're not interested in learning the ropy facets of sailing at all, simply lean back and enjoy a two-hour cruise while observing Boston from the water.

All proceeds from Courageous Sailing's commercial ventures go to support its children's sailing programs, which serve more than 1,000 disadvantaged children each year, free of charge. Its programs teach kids the fundamentals of sailing and the benefits of cooperation while educating them about community service and environmental stewardship. So as you strike nautical poses and pretend you're in an '80s music video, you can feel proud knowing that you're making a genuine contribution to the future of the community.

Learning the bare basics of sailing is a fun and absorbing activity to engage in with a friend, relative, or romantic partner—one that certainly beats another afternoon of Twilight Zone marathons. Call ahead to schedule your voyage with Courageous Sailing Center. Groupon customers also receive $95 off a future membership or sailing class.