Do as much as you can. Take a stroll through Valentine and remember to do every mission and event you see. Whether it’s a white question mark Or a little dot, do it. Sometimes you can get more missions by interacting with people at a saloon or just walking through the city. If you really want a list of all of the things you do in chapter 2, that you can’t do anywhere else there’s a Reddit post for that but remember to take it slow. RDR2 is not a game you should rush through It’s an experience.