In a few months, I'll be returning home after a year or so away from diving. My plan is to spend several weekends at a quarry just diving. I'm looking for suggestions of what to do/skills to practice while diving. So far, I've come up with things like UW nav, shoot an SMB, terrain mapping, etc. I wouldn't include things like bouyancy because that should be a part of every dive, not a purpose. It's a bit like saying that the focus of the next static line jump is to focus on body position.