Minnesota doesn't exactly have the ideal environment for year-round amusement park fun – unless, that is, you put the whole amusement park indoors. That's just what they've done with Nickelodeon Universe, housed entirely inside the Mall of America.
Nickelodeon Universe is a seven-acre amusement park that's completely indoors. It was originally opened in 1992 as “Camp Snoopy,” and has undergone a few name changes over the years. The current park was completed in 2008, with new rides and a new theme.
It's difficult to overstate the vast size of the indoor park, but even still there are some limitations on the types of rides you'll find there. Most of the rides are relatively flat – there are several small roller coasters, but nothing too tall that would interfere with the glass roof. In addition to the wide variety of amusement park rides, Nickelodeon Universe also features an adventure obstacle course and an “adventure golf” course.
Because the park sits at the center of the Mall of America, it's free to get into Nickelodeon Universe. The rides, however, require the purchase of “Point Passes” or wristbands. A wristband good for one day of unlimited rides is $31.99. Point Passes range from $20.99 for 20 points to $62.99 for 85 points – each ride requires a different number of points, so you can buy only what you need. The park is open Monday-Thursday 10am-9:30pm, Friday-Saturday 10am-10pm, and Sundays 10:30am-7:30pm.