I just went parasailing the other day, but I kept thinking "If I had brought my laptop and tethered my phone I could push code from up here..."

I find the most relaxation comes from doing something that ties all my senses up in a way I'm not used to. Like swimming, a really hot sauna/steam room/cold pool, hitting the weights, going to a museum, taking a girl on a date, cooking (I don't do it often so it's fairly immersive).

I tend to obsess about work so I find I need to take an active role in giving myself these types of "breaks", otherwise I become unhappy.