What you would love?

Whips
The logo in front of the trains (like the custom billbord thing)
be a ride operater (strap peeps in,work the ride)
rain on sandbox mode
easier to do dark rides,water dark rides,ghost trains
haunted houses
ready built stations like you had on rct1,rct2 like abstract,wooden,igloo
real parks like cedar point,geugia lake,kennywood,valleyfair.
side shows like test your strength,coconut shy
better restrants , that dont take up one square
rides like the bling at blackpool
entrances that look like path (say a cement path is the que)
signs like on rct2
and finally that you are a peep and get to walk around the park