If you liked zoo ****** and have a pretty powerful graphics card then Rollercoaster ****** 3 is good. You can buy a pack with the original game and its two addons (soaked and wild).
As rollercoaster obviously is a theme park simulator, Soaked adds swimming pools and water chutes, and wild adds zoo animals. You can mix these 3 areas together in one huge park with rides, animal shows and fireworks.
However I will stress again it does need a pretty good graphics card to run nicely.