I know I sound like a broken record with this, but I can't praise Rockstar enough for how they relate the experience of talking to, riding and caring for your horse. I've never played another open world game where I took so much pleasure in slowly ambling from point A to point B, and the little random adventures that pop up (plus campsites that seem completely random as far as I can tell that disappear from one day to the next) are more fun than most games' main story arc.