A1) The main question should be what you CAN'T literally do here. You can do anything or everything in this game. You can steal any car, get any kind of weapon. Jump and run anywhere you want in this big world. Only big things like trains and aircraft aren't available here in this game. Those are available at other series of games from next to this one. You can roam around in between so many civilians as well. As the place is really a very crowded city in my opinion.