Have a Staycation

Have you heard of a "Staycation?" it's instead of a Vacation! Saves you time and gas money since you aren't traveling very far from home. Become a tourist of the area you live in. Go to the museum on the free day - most museums do. Go to the park. Go see a dollar movie. Check out the "old town" or shopping strip and take "the tour" if there is one.
Go camping! Its about as free as you can get - especially if don't go to established "camping grounds". Heck, camp in your back yard - the kids will love it.