For every action there is an equal and opposite reaction, which is why every time a human attempts to fly, a bird attempts to drive a stick shift. Engage in one of the primary mandates of physics with today's Groupon: for $55, you get a parasailing tour at the standard height of 600 feet) from Dennis and Provincetown Parasail & Jet Ski (an $89 value). This deal is valid at the East Dennis location at Sesuit Harbor from June 25 to July 31 and at the Provincetown location on MacMillan Wharf from June 30 to August 31.

Dennis and Provincetown Parasail & Jet Ski provides guests with an exhilarating glide through the air. The adventure begins with the low rumble of the boat's engine starting, whereupon the parachute-strapped passenger takes off into the air with the graceful ascent of a martian returning to the mother ship. As sky riders surf the clouds, they drink in views of sandy beaches, ocean waves, and Earth's bald spot, which is visible only from an aerial vantage. At the end of the ride, customers can opt for a brief toe-dip into the sea before executing a James Bond–like return, parachuting gently onto the back of the boat.

Groups of passengers on each tour can take turns riding, the tour usually lasting about an hour. Depending on weight, wind conditions, and the safety-based decisions of the captain, patrons can strap in for tandem or triple rides, allowing three-legged races to extend skyward uninterrupted. Each mariner and sea craft is Coast Guard–approved and insured, assuring a full recovery of your gold coins lest you encounter marauding sky pirates.