Riding a bike is an easy way to minimize your carbon footprint, like reusing plastic bags as wedding gifts. Make the world a better place with this Groupon.

$10 for $20 Worth of Cycle and Watercraft Rentals

Cycle rentals include the four-seat, double surrey ($30/hr.), the two-seat, single surrey ($20/hr.), and single-seat cruisers ($8/hr.) or quad sports ($10/hr.). Watercraft rentals include kayaks ($10/hr.), double kayaks ($15/hr.), and double pedal boats ($30/hr.).

Wheel Fun Rentals

When Brian McInerney reflects on the humble beginnings of Wheel Fun Rentals, he points to his childhood passion for bikes. "As far back as I can remember, I had a real love affair with bicycles," he recalls. During a trip to Italy in 1987, Brian's affinity for cycling blossomed into a full-fledged obsession when he spotted locals' transporter of choice, the surrey. Inspired, he began importing the Italian four-wheelers to a rental business in the U.S. that eventually expanded into Wheel Fun Rentals, now a nationwide web of shops that also loans out bikes, electric cars and mopeds, and man-powered watercraft.

Atop bicycles and surreys built for solo riders or entire families, patrons embark on self-guided tours of major U.S. cities. Led by maps and lists of nearby sites of historical or cultural significance, riders zoom down bike paths and safe, lightly trafficked streets. Adventuresome athletes can also compete in activities such as surrey scavenger hunts.