Riverview? Are you sure? xD
Yes, there are quite a lot of bars and venues, but those are needed for people who want to make the most out of having all the expansion packs (See first post, right after the banner, it says all the stuff you can do with this town).
The stadium having 2 icons is not a fact to worry about. Ignore the Binder Clips icon and keep using the stadium one normally.
If those mentioned lots aren't purchasable, it's probably by game design, as I didn't do anything to them that would change this much.
It's okay to remove Mad Bronco's Bar and put a Police Department there, but if you remove the city hall (and the police dept with it), all sims who have political and law-enforcement careers will lose their jobs. If you want to do that, you must first place another city hall and another police dept somewhere else in the map, then remove the combined one, then place the new ones.