Listen to my favorite composers/musicians.
Watch classic movies
Funny that I started this thread. Today after work I went to the nearby Japanese Garden. It was only the second time I went there; first time it was during the lunch break, so not much chance to relax. Today I was able to really enjoy my walk in it, looking at Ikebana arrangements, watching the ducks in the pond, watching the small waterfall, drinking Japanese green tea, sitting on a bench, etc. Unfortunately they close at 4pm, so normally I can only go there during lunch, and that is not particularly relaxing. I won't forget though how relaxing it was to go there after work.