Biologists estimate that water makes up 65% of the human body, 71% of the planet's surface, and 0% of the R & B group Earth, Wind & Fire. Conquer the planet’s most prevalent liquid with today’s Groupon: for $24, you get one all-day admission to Fallsview Indoor Waterpark in Niagara Falls (a $52.32 value).

Across the street from Niagara Falls, Fallsview's 3-acre indoor water park pays homage to its muse with 16 waterslides up to 6 floors high, a wave pool, and two children's splash parks. Race friends, family members, or competitive water molecules down the Kamakazi slide that spritzes thrill seekers with a refreshing spray, or blaze through the intertwining twists, turns, and drops of the Toob Tower's vibrant purple, green, and orange waterslides. Tubing and bodyboarding physiques surf 4-foot swells lapping up on the indoor wave pool's gradual beach entry as guests dehydrate limbs on the indoor beach's lawn chairs. Adults warm up on a heated outdoor sundeck or in two oversize adult-only hot tubs while keeping watchful eyes on little ones. Peoplelings frolic in the Beach House's playground, outfitted with rope ladders, eight slides, and a 1,000-gallon tipping bucket with a weighted hair trigger, poised to soak the whole playground. Children can unprune their fingertips in the completely dry Jungle Beach Playland, exploring badlands and climbing trees to survey the water park from a great height. A comprehensive FAQ page answers all questions indoor seafarers may have, such as "Are life jackets available?" and "Do they work?"