If you haven't signed up, check out the website and see if there's an alley near you! We always get the adult pass, too. I've found it well worth the $25 for 4 named adults!
Bookworm Wednesdays at our local cinemas.
We participated in another free program where you log reading hours and get free passes to Six Flags with the Read to Succeed Program, but I'm not sure we will actually use them as it's not close and would be a very long day trip. We also have plans to visit a different, more kid-friendly theme park so I'm not sure we need to do both anyway!
What free or almost free activities do you have in your area? Do you school through the summer?