Without water slides, adrenaline-starved swimmers would have no other option than hanging ziplines over aboveground pools and hoping for the best. Enjoy aquatic thrills with today's Groupon: for $119, you get a one-night stay in a queen deluxe room and water-park access for up to four people at KeyLime Cove in Gurnee, Illinois (up to a $222.90 value).

Water flows freely at KeyLime Cove, whether filling the pools, rivers, and play structures of the 65,000-square-foot water park or washing toothbrushes in the more than 400 guest rooms. Recreational merpeople flex their gills in the Lost Paradise Waterpark, transforming into human-shaped torpedoes on colorful slides and perfecting driftwood impressions while floating down the lazy river. Lifeguards patrol the decks to ensure safe, slippery fun on aquatic jungle gyms, and lackadaisical guests enjoy the continual 82-degree temperatures lying next the to wave pool getting imaginary suntans. Recently damp families head to their queen deluxe staterooms, where colorful, Florida Keys–inspired décor surrounds a pair of queen beds and a range of amenities including a flat screen LCD television, Simmons Signature II mattresses, and an iPod-compatible alarm clock.

After working up an appetite at the park, guests can visit one of the resort’s restaurants for dinner, wind down at the on-site spa, or prowl the Rip Tide Reef arcade to trick kids out of their allowance with games of cutthroat skee-ball.