I can't even count how many hours I've spent just wandering around aimlessly! Honestly, BotW is just so relaxing that even just exploring without a goal can be really entertaining to me.
I've been thinking about trying to learn how to speedrun the game, but on my actual main playthrough, I've been trying to find all the shrines. Never did that on my first playthrough, so it would be nice to do it this time!