Sleep. There's nothing better than a good night's sleep. Naps are good, too, if you can't get 7-8 hours at night. And so important for healing.
I used to be very bad at sleeping. This summer I bought an adjustable bed. It is fabulous! It was kind of expensive but who can put a price on a good night's sleep. You can now use them with a regular spring mattress so that is what I got since the foam ones would make me sweat to death.