Hi P.-
I see you live in Arlington Hts. like me. We have gone to Lake Arlington and rented the paddle boats for an hour. Great exercise and the price isn't too bad. Just riding bikes around there is fun and free and building sand castles too.
Party Palace (Des Plaines or Mt. Prospect) and Go Bananas has active stuff to do such as jungle gym and moon walk... both of these activities are free. (Go Bananas has a coupon on line for 6.99 for all day ride pass and they have tokens for arcade games.) My daughter rode on the bull and enjoyed it at Party Palace. They have laser tag and miniture golf too. I see coupons for this place sometimes... it's new.. it's on Golf and Elmhurst Rd.
My kids like Pioneer Park in A.H. and riding bikes around Kimball Hill School in Rolling Meadows and then going to Cardinal Park nearby and the Dollar Tree is always fun and cheap.
How about Brookfield zoo or a small petting zoo called Randall Oaks? There's also another petting zoo in Glenview... can't think of the name.
Indoor waterparks or swimming pools is always an option. Rock climbing I believe some YMCAs have it and Dick's sporting goods... not sure about the minimum age, though.
Bookstores and petstores are always fun to visit... and they can be inexpensive if you limit yourself! Take a ride on the trolley at Woodfield(free) and stop at Ikea. (I don't know the height restriction.... but kids can play for an hour while supervised so you can shop solo! (complimentary service)
Buffet type restaurants are always big with my kids... like Old Country Buffet. Rainforest Cafe is a fun eating establishment in Woodfield.
Bowling alleys have specials. I think the one in Elk Grove is 99 cents a game on a certain day.... I think Thursday.
The Buffalo Grove Theater has movies that have been out for awhile... BUT it's only two dollars to get in.
Check with the library. A.H. has so many free and worthwhile programs for kids. Maybe they might have something this week. In the kid section at the library they often have booklets called Oakley's Guide... take one... they are free and there are so MANY ideas as to where to take your kids... look for coupons in the back. You can also go to their website for info.
Well... have a fun week. It's also a perfect time to get together with friends you don't see a lot and just have playdates at home or at a park.