CoCo Key Water Resort

Inspired by the lush environment of the Florida Keys, CoCo Key is 65,000 square feet of breathtaking excitement. Located at the Sheraton Chicago Northwest in Arlington Heights and in The Clock Tower Resort in Rockford, these water parks are open year-round. These resorts are fun for the whole family, and offer great dining, well-appointed guest rooms, and even game arcades.
Learn more at http://www.cocokeyresort.com/

The WaterWorks

With three water slides, a rapid water channel, and a water playground, the WaterWorks in Schaumburg can help any family shake off the winter blues. Just 25 miles from downtown Chicago, wacky and wet winter fun is closer than you think!
Learn more at http://www.parkfun.com/dir/fit/ww/wtrwks.html

Mayan Adventure Indoor WaterPark

The Holiday Inn in Elmhurst (just minutes off Interstate 290) is home to 24,000 square feet of wet and wild fun for all ages. Tube rides, a plunge pool, a vortex pool, a zero-depth interactive playstation, and a dumping bucket welcome you year-round. Mayan Adventure is Chicagoland’s first water park, and, according to families who return again and again, is still a thrill a minute.
Learn more at http://www.mayanindoorwaterpark.com

Grand Bear Falls Indoor Waterpark

The first water park in the nation with sound and motion technology, Grand Bear Falls takes swimmers through tubes, pools, and amazing virtual reality adventures. This $90 million indoor water park opened in Utica in 2005 and has been rocking ever since. Accommodations at the privately developed Grizzly Jack’s Grand Bear Resort include 100 two-story villas, an 18-hole miniature golf course, a spa, and 56 rustic log cabins.
Learn more at http://www.grizzlyjacksresort.com/

Key Lime Cove Water Paradise and Resort

Right across from Six Flags Great America and the Gurnee Mills, this over-the-top resort, spa, and water park features a tropical-themed water wonderland, a 6,000-square-foot arcade and entertainment center, and a state-of-the-art fitness center and spa.
Learn more at http://www.keylimecove.com/