Skiing both at ski areas and backcountry.
Climbing trees. I've done this for work for a long time. It sounds just like rock climbing, but it's different if you want to do it in good form. It's fine to spike up a tree if your goal is to kill the tree. If you just want to summit then you need different tactics in the same way rock climbers look down on over bolting.
Watching sports. I'm no diehard fan, but going to see a major league game can be a good time.
Reading.