I have RCT3 gold from steam and I want to download a park from this site but I can't find the parks folder in steam>open file location blah blah blah. I've used this way many times to download custom scenery and coasters but I cannot find where to put in the park I downloaded.

There's this stupid thing where RCT3 has 2 completely separate folders on your computer, the parks folder is in My Documents>RCT3
Hope it helps and happy building!
Nave