If this is going to be anything like The Witcher 3 then i'm looking forward to heading towards a mission only to get distracted and sidetracked, and then start the mission i was heading to 8 hours later. But as for what i want to do the most...anything and everything, and while that might be an across the board answer, there's too much to do to narrow down and pick out any singuar thing that i want to do the most.