CoasterVille is a social game, simulation park-themed, free to play on Zynga.com and Facebook, from Zynga.
"Create your very own theme park, design exciting attractions and share the thrill with friends. CoasterVille takes the joy of theme park attractions and combines it with adventurous lands, quirky characters and new social features to bring players a magical world with endless possibilities. Be thoughtful when placing coasters, restaurants and service buildings to expand your park faster. Don’t forget about customer service, guests will let you know when they're hungry, bored or even in need of a bathroom break."