If you don't have any extra cash, you can soak in a hot tub (most people are so busy that even the time for a shower is begrudged). You can reread a favorite book or watch a favorite movie. Youcan peruse the local library and may discover some interesating books, movies, newspapers, or magazines. If you do have cash the sky is the limit.
You might consider some activities you have not tried or not tried in a long time like bowling, pool, going for a drive, or treating yourself to a nice restaurant. You might even visit a church you are unfamiliar with just for the experience.
Good luck.