River-tube rides enable a more relaxing interaction with nature than outrunning a mob of butterflies or being audited by the Forest Service. Avoid stressful encounters with today's Groupon: for $25, you get $50 worth of lazy river tube rentals at River's Edge Resort in Wisconsin Dells. This Groupon expires on September 15, 2011.

Located along the shore of the Wisconsin River, River's Edge Resort beckons sun sultans with a fleet of floatables for coasting down mellow waterways. Corral a herd of anxious sun seekers on a two- to four-hour ride past secluded beaches, sandbars, and nudist horse colonies. Crews of 1 to 6 ($15/tube), 7 to 12 ($12.50/tube), or 13 or more ($10/tube) can take to the water atop inflatable, inedible donuts. Additional cooler tubes ($5 each, cooler not included) are optimal for tugging icy beverages, cold sandwiches, and vats of summer-sausage-scented suntan lotion. Drift past beauteous bluffs and rock formations along the Wisconsin River shoreline and engage in a prolonged staring contest with the sun, or break up the journey by stopping to sunbathe on beaches or shorten legs by immersing them in sandbars.