Theme Parks are, to simply put, amusement parks based upon a theme of some kind. They can range from campy mom-and-pop affairs, such as those tucked in among the lovely glacial ravines of [[http://www.visitwhitemountains.com/things-to-do/attractions/default.aspx New Hampshire's White Mountains]], to high-tech vacation destinations run by big corporations, like the Ride/SixFlags parks and Ride/UniversalStudios. And, of course, the Ride/DisneyThemeParks. For a whacking load of pictures and videos from ''many'' parks all over the world, go to [[http://www.themeparkreview.com/ Theme Park Review]]. Yes, it's ExactlyWhatItSaysOnTheTin.
Outside just themed environments, theme parks often try to tell stories through their attractions. It's mostly the larger theme parks that put this much effort into this, using incredibly detailed sets, animatronics and special effects to really push visitors into the setting.
Speaking of, Disneyland is certainly the TropeMaker here. See also SouvenirLand and AmusementParkOfDoom. A related trope is TheThemeParkVersion, used to describe something that has been simplified and sanitized for mass consumption.
For the video game, look at ''VideoGame/ThemePark''.
!!Notable Theme Parks, Rides and Shows: