Before there was RollerCoaster Tycoon there was Theme Park for the Sega Genesis and PC. This game was made by BULLFROG who made a lot of fun games back in the day. And in it you take control of a Theme Park what else? It is a scenario based game with the scenarios getting harder and harder as you go along.
This game has a lot to offer even now. There are quite a few rides and shops and tons of different vanity items to litter your park with. You choose how much to charge for admission and shop items and how much to pay your staff.
And when it is all said and done you try to sell your park for the highest profit! You can really make your park your own with any layout you can imagine. There are certain rules of course, your visitors will need paths to get where they are going and such. But of course you can break or bend the rules if you really want. You can add one way marks to pavement to control traffic flow and so much more.