A subway, mointains, maybe fields? or forrests between sections of towns to divide them, not just big ugly grey blocks! Diggy's trees look nice in the city.
No towers, Houses are ALOT nicer!!!
Maybe easier ways to make money when you begin playig because it can sometiems be hard as a noob since you've got nothing but a small sum of money.(but that's more scripting or whatever)
Bridges are always nice!!!
OH WAIT I have the best idea, BRING THE OLD CITY BACK!!!! find an old save and semolish all the builds, and remove parts of the city if it's too big or has too many lots. The trenton cities were always the best planned with the mountains and roads on the sides and subways and NICE BUILDS!!! Althought I wasn't a big fan of the huge red castle...