It is easy to entertain kids over the weekend or during a vacation when the weather is warm. But when the rain and snow trap them indoors, keeping them happy is much more difficult, unless you are near one of the fun indoor adventure and amusement parks, where even the largest rides are safely enclosed in a warm space. Las Vegas has the Adventuredome, with 25 attractions under a massive dome. Funplex in Houston has more than 200 rides and attractions. New Jersey has iPlay America, with over 200 rides and games. Cleveland has the 1-week-long annual I-X Indoor Amusement Park with a Ferris wheel and all sorts of other attractions. Wisconsin Dells has its Africa-themed Kalahari Indoor Theme Park, and Bloomington has Nickelodeon Universe, the largest indoor amusement park in the world