Cuddling with the DW under a blanket watching a movie.
Play computer games and x-box with my kids.
Buying broken computers and fixing them (I find it relaxing).
Programing useful utilities for our use (like rewards systems for the kids, allowance tracking for the kids to help them determine how much they should spend and how much to save, recipe databases to make it easier to find, plan, and shop for meals, things like that).
In the summer camping, fishing, hunting, boating.