I've done an amusement park. I would recommend LeMax rides. They work well. There were always 1 or 2 sellers at York so it was easy to see the models and select what worked best for you. I go for "fun" rather than realism. If you do that, I would suggest LED flashing lights with changing colors as part of the park.
I tried to put a roller coaster together about 10 years ago. I think it was Coaster Dynamix. I spent a lot of time and it didn't work.
Gerry