This might sound crazy, but you really can warm up in the dead of winter by taking your clothes off. Get your mind out of the gutter and hear us out. Water Park of America is usually a site of pure childhood mayhem, but when the coldest months start sapping your will to survive, it's also a great place to beat the winter blues by sliding, spinning, and cruising through 300,000 gallons of warm water. Try out your surfing skills on the FlowRider, which pumps 24,000 gallons a minute to a cruising speed of 25 to 30 mph. When you're wrinkled and warmed, don't forget to dry your hair and put on your layers. The brisk winter wind chill is a real shocker when you are forced to head back into the real world.