Denver in the 90s or later. Skiing and snowboarding, a bunch of crazy crime cases to parody. (e.g. Columbine, Ramsey, Batman shooter)
A GTA in a mountain city would be neat. They could really capitalize on that 90s feel too with Denver in my opinion.
On to the wishlist:
31. An economy that moves. Small businesses would go out of business if you perpetuate crime in certain areas and some storefronts would be replaced with an "out of business" texture instead. Also billboards would switch around every few times you save the game. Stuff like that.
32. A working political system. Campaigning would be a thing you could interact with as a player. If an incumbent mayor's district started going to sh*t they'd get criticism on the radio accordingly. Stuff like that.
33. Secret interiors/caves/little places with lots of thought put into them for no real reason. GTA IV had a lot of places like this, places that looked awesome despite not being involved with the story. I'm not sure whether V had much of this, I haven't played much of V, but it's something I very much want to see again.
34. Pedestrian occupations. An added layer to pedestrian complexity. Basically there'd be like thirty occupations any pedestrian could have, and it would sometimes be worked into random dialogue, and you'd be able to see the pedestrians on their commute to/from work, and go into certain buildings according to what they do.
35. An afro hairstyle. Regardless of what race/gender the player is. I want an afro!
36. Working construction. Similar to the business idea. Minor construction would work like storefronts showing a "not open yet" texture, and later on changing to a regular storefront. Major construction would work like the big construction site in V, where it builds up over time, except it would actually get built eventually. Construction workers would spawn in either case working around the buildings. Same idea could work for streetwork.
37. Hammers, for the construction workers to hold and use as melee weapons.
38. Interiors for every building. They don't have to be accessible, I just mean little doors for pedestrians to open and walk into. Lots of games do it; usually there's like a dark void inside the doors. Bully did it, for example.
39. More interesting pedestrians, like street performers and street preachers, and have other pedestrians spawn around them and watch more often. Especially in very public places, like parks and busy downtown street corners.
40. Accessible buses. They'd work like the subway did in IV, except they'd be a little more chaotic because they'd have to deal with traffic and the possibility of the player planting sticky bombs along the route.
My bad for all the other critcisms, I didn't even realise you accidentally confused GTAForums for SaintsRow Forums.
Y'know, it was his wish list.
(Whoops, the continuous numbering threw me off. I guess it's our list now. )