Awesome game where you design and build your own amusement park, Deck it out with security guards, mascots, and bathrooms. The most awesome feature is designing your own roller coaster. You can tweak the speed, construction, shape, color, almost any parameter.

Amusement Parks are my most favorite places to go ever. So when I couldn't go when I was younger it was ALMOST as much fun to build them on the computer. (via amazon.com)