Really great ideas in the posts above!
What I would like to see:
Instead of watching PC video streams, I boot up the game, attach to a server, and I'm first person with my avatar along with hundreds of you folks, watching Chante & friends in their park. A massively multiplayer PC - play similar to the current version for the park owner, but the rest of us are guests, free to move about as we wish (and there had better be priority passes!). VR would be awesome for this.
Another multiplayer notion: Multiplayer scenarios - two or more tycoons competing against each other - starting with limited cash, each player purchases land, issues stock or bonds to raise additional capital for expansion, and ultimately puts the other tycoons out of business in various underhanded ways.
Remove tedium where possible. Adjusting shop extras (do I want to give guests, "some" or "a lot"?) is not a brilliant gaming idea. At least make settings persistent, so that whatever settings and prices used in the past become the default for the next park. That goes for flat ride animations too.