Do a few different things as time allows. As well as the obvious out in the woods stuff, it breaks down as follows really.
Anything aviation related, but thats to do with the job. I'm sad enough to fly even when I'm not getting paid to do it. I also love visiting old aviation museums though, and seeing what the guys took into the air before I came along. Also hobby engineering, turning on a lathe etc, fabricating parts, designing solutions and re engineering items, as thats again to do with where I started my working life and keeps my mind occupied when I have down time or what not.
On the more physical side, well I am working towards my FAC1 as I love to target shoot, and really enjoyed the limited amount of shooting I did while in the service. I also do something called combatives. I did Krav Maga for a long time (started back in the 90's) and a while ago realised much of it came from Sykes-Fairbairn and their combatives system, so I've started into that and I'm really enjoying it. I'm lucky enough to be getting taught by a Royal Marine instructor with 30 years plus experience of it. The bruised ribs I'm just getting over are proof that I have much road left on that journey!
Mate also has an MMA gym, so we like to spar etc with him, but I'm not into the whole MMA thing at all. Useful for the exercise and different styles.
Also a bit of a gear head. Like cars, and have a dedicated track car, but sadly due to working hard last year never got a chance to track her. Maybe this year. She's all rebuilt and ready to go, so hopefully the weather gods and the spare time gods can have a word with each other this summer.