I havent run around the map yet, but I like the screenshots!
This theme had huge potential, I suggest you add:
-more vertical clutter, everything looks very flat with no focal points. If not, you may have to put work into a 3d skybox
-have clear separation between paths and rides, (take zoo for example)
-Lighting should fix the bland colors, dont worry about that
I'm excited to see what you have in store!