We are grandparents of a 2 year old and a 3 year old. We went on a very cold and rainy Sunday and arrived right at 11:00 am - opening time and it didn't really get too busy until after 12:00. We were pretty impressed with all of the great play areas we were able to get to in the short time we were there. The kids loved the kitchen and grocery store. The 2 year old loved the water features. It was such a good visit that we bought the deluxe family package. It includes tickets for our daughter, her husband and children plus two extra tickets for guests every time they visit. The membership also includes discounts on the cafe and gift store. I think kids could spend most of the day there on just one floor. With all the rain Olympia gets it's just a smart investment. I agree with others here that it's best for each child to have a parent or caregiver watching them. One, the older kids tend to run the little ones over and it's good for parents on both sides to keep close watch. Two, it seems the museum doesn't have a security system to keep kids with parents like they do in churches, etc. Olympia has a lot of great features but this Children's museum should be at the very top of your must see and do list!