Take advantage of all the free events in your town. We live in a suburb of a medium sized city and there are so many free events every weekend - there is no excuse to have nothing to do. Pack a lunch or snack and head out. If you don't know how to find something, look on the internet, in your local paper or visit the tourism bureau.
We have several free events this weekend to pick from - not sure which one we'll attend, but it will be fun.
Check out all the other Frugal Friday ideas at Biblical Womanhood