Also try foam rollers. I have some soft tissue issues (bad left leg ITB), so I can easily kill 20-30 minutes on rollers and get the satisfaction that I'm doing something that will make next week's exercise more productive.
You can also take a walk or go for a bike ride, just keep it relatively short, and try to keep it mainly below your aerobic threshold. Search for articles and forum threads on "active rest" and "active recovery."
My wife usually has some chores lined up for my "days off." I've tried to convince her that active recovery is meant be pleasant, rejuvenating activity, and then suggest such an activity to give her an example. She always responds that watching her man do house work is known to be one of the best turn ons for a woman. I'm a stickler for the scientific method's demand for replicatable results