I like the library idea.. I was going to respond with that. :) The library may also have story time or arts and craft specials going on also.. not just checking out books.
I also found this great site with alot of freebies or bogo coupons, you just have to sign up for them using an email account. (Suggestion: create new email specifically for these emails for freebies.. otherwise they will overwhelm your inbox) Take some time to look through! There are also a list of restaurants for free meals for kids
http://mommyswishlist.blogspot.com/
Also, check out Lowe's and Home Depot for their free Build and Grow workshops.
https://www.lowesbuildandgrow.com/
I haven't found a link for Home Depot that shows their workshops.. but a quick trip to a store or even a phone call will net you this information. The kids get to build something and take it home!!!
Here's one for Michael's: http://www.michaels.com/art/online/static?page=kids_events
Use google too. Search for free craft ideas or the such!
And please check out Mommy's Wish List link at the top. That's where I found all these links I just shared.
Also, do you have an entertainment books? There are a ton of places you can check out also. Your 7 y/o may enjoy the Dinosaur Muesum in Woodland Park. I am pretty sure there is a coupon for them in one of the entertainment coupon books.
http://mommyswishlist.blogspot.com/2009/02/free-eats-in-e... These books are now 50% off the usual price.
Well, I hope this helps! Have a great spring break!!
T. K