You can skin the animals you kill and take their meat to sell. I killed one random dude butchering a prostitute. Curiously enough, that was a highlight. You can get into fist fights and duel at ten paces type stuff. Mini missions, large missions, bounty hunting, whatever you want. There's even a movie theatre, poker games - which you can cheat at and get into shoot outs over, you can play the horse shoe throwing game, or the one where you tap a knife between your fingers. You can hunt for gold, or just go on a murder spree. You have a lasso that you can catch what-the-fuck-ever with except lynching - so far - and I don't think you can scalp people.
MASSIVE map, but you do have the option of bouncing quickly between townships if you get tired of riding. You're doing too much to really take in much of the scenery, but it looks great. A FRACTION glitchy, and I think Just Cause 2's scenery looked better, but it's hard to fault.
Get it, I don't think you'll be disppointed if you like that sort of thing.