So I'm having an issue that's not serious, but still annoying. I can't make the game go full screen, it just takes up like 2 quarters of the screen. Anyone know how to fix this issue?

Changing resolutions etc. in RCT1 has been a pain in general since XP at least. It'll take you multiple tries and several game restarts to do it. :/

Is there any way, any way being mod or what ever, to change the UI size? I play on my TV and if it wasn't for the fact that I've played this game since childhood I wouldn't be able to tell what anything does.

Anyway to change that? I have to squint and get close to the TV to tell what's goin on.

There's a way to boost the maximum resolution a bit, but it's quite limited. http://www.gog.com/forum/rollercoaster_tycoon_series/hack_run_rct_full_screen_at_any_resolution_up_to_1280x1024/page1

The UI can't be magnified, from what I know :/