Paramount's Great America is an amusement park that has a theme park as well as a water park (Boomerang Bay)! It features several roller coasters (featuring Invertigo) as well as other rides. There is also a carnival setting where you can play games. There are live shows and plenty of fun for kids (as a kids park is also available). Kids can meet there favorite Nickelodeon characters too!
Tickets prices are as follows: right now Season Passes are available for just $49.99 (this includes admission into the park all season long), regular pricing includes adult admission for $53.99, junior/senior admission for $35.99, 2-day tickets for $59.99 (this is for admission 2 days in a row and must be used by the same person), and there is also a ticket available for $29.99 that includes admission after 4 p.m. that is only available at the front gate.
There are also group rates. Opening day for the regular 2009 season is March 29th, 2009. The park returns to opening for weekends only on August 29th, 2009.
For more info, please go to http://www.cagreatamerica.com/.