I used to take a drive to clear my head, now I ride my bike or take a stroll to the beach.
I love the library, they have movies, books and periodicals for free that I can check out. I sure save lots of money on movies and tv series that I used to pay money to rent. And the bonus is, the library copies of dvd's are ususally in better condition because its a little known fact that they lend them out!
Fishing! There is a bit of an initial investment in poles, tackle and a fishing license, but it pays off. And the bonus is, you can eat your catch and cut your grocery bill.
Gardening, even indoor container gardening. I can't even begin to tell you how relaxing it is for me to play with my plants.
and the one thing I don't do often enough, watch TV. sometimes you just want to channel surf, and thats OKAY...sometimes.