Well, I will say it.
I am going to create instance maps of places on earth to use generically in some of my adventures.
Star Fleet academy
Star Fleet HQ
various other locations....The Vulcan compound ....all kinds of places
I am surprised nobody mensioned it yet
Not sure that's really possible.
As far as I've seen there are very little to no Federation building models in existence at the moment for you to use, let alone anything that would capture the unique feel of the buildings we've already seen on screen. Terrain, as I understand it, also can't be changed and all we can do is choose from surfaces they've already made and used.
Plus... any view of San Fransisco and Paris would be lacking if you couldn't see the Golden Gate Bridge and Eifel Tower in the distant background. In fact.. I don't think there's any surface in STO right now that demonstrates a capacity to have complex "out-of-bounds" backdrop, such as city-scapes.
Anyway... feel free to try, but I'd be prepared for frustration.