Parkitect is a great game. It offers a lot of customization to make the themepark your own, completely. And through parkitectnexus.com you can extend the game even further with mods, rides and attractions made by the community. It's a great successor to the themepark tycoon games of old.
This game is 13 years old now, and still it's a lot of fun to play. To play it on Linux, follow these steps: http://www.pcgamingwiki.com/wiki/Unreal_Tournament#Linux Use google to find the Loki installer file (just google the filename in that howto)
