There's another thread that I put this in but I figured a new post would help for visibility. I uploaded a scanned copy of the original English Manual that came with my DOS version back in the 90's to archive.org and it can be found here:

https://archive.org/details/theme-park-scanned-manual

Cover wasn't in the best condition but the rest is pretty decent. Hope it helps anyone who stumbles across this out!

Cheers.

Very helpful for the people, who don't own the original game.