Traveling by boat offers an aura of romance not matched by cramped cars, bumpy motorcycles, or terrifying man-sized slingshots. Cruise in comfort with today's Groupon: for $21, you get a roundtrip ride on the Plymouth-to-Provincetown Express Ferry (up to a $42 value). The ferry departs from the Mayflower II state pier in Plymouth at 10 a.m. and departs again from Fisherman's Wharf in Provincetown at 4:30 p.m.

Helmed by experienced, licensed captains, the Plymouth-to-Provincetown Express Ferry quickly transports sea-goers across historical Plymouth Harbor and Cape Cod Bay. As the high-speed vessel embarks on its approximately 90-minute journey, seek shelter from wayward water droplets or gregarious starfish inside the enclosed main cabin while listening to a narrated history of Plymouth. Upper- and lower-level decks provide passengers with beautiful views of Cape Cod Bay's waterlogged scenery, and snacks and beverages are available for those with money or tradable fur pelts. Once the boat arrives in Provincetown, travelers have up to five hours to explore the city's numerous art galleries, restaurants, shops, and colonial-themed dance clubs before returning to the original point of departure. Check the schedule for more information.