My family is going down to Orlando for Thanksgiving week. While we will be doing Universal, I am looking for ideas for free to really cheap things to do with my kids. they are ages 14, 12, 10.
We have two boys 14, 11 who love going to zoos and science museums. So we purchased a family membership at our local science museum. We also purchased a family membership at the National Zoo (through their website). With these 1-year memberships, we are able to go to science museums and zoos throughout the country (and Canada) for FREE.
On our last trip to Orlando, we visited the Orlando Science Center and the Central Florida Zoo in Sanford, FL, all for free. On our next trip, we will visit the Jacksonville Zoo on the way down. And while we're in FL, we will go to the Brevard Zoo in Melbourne, FL and the Lowry Park Zoo in Tampa. And we will go to the Florida Air Museuem at Sun n' Fun in Lakeland, FL.
The family memberships costs around $60 each depending on where you purchase the membership. I know, it's not "free", but I believe it's a worthwhile investment. This year, we went on several small trips around the country and Canada. In each place that we went to, we were able to go to a zoo or a museum for free.
I see that you are from York, PA. When we were in Hershey back in July, we visitied the Hasco Science Center in Harrisburg and ZooAmerica in Hershey. You may be able to get a family membership at both of these attractions.