We liked Crayola!
Are your kids artsy? My kids love to draw & create; they had a blast there. Older two were 4 and 7 when we went. They just asked about going back -- and they're now 7 & 10.
It is all inside, tho. I'd either save it for a really hot or rainy day when you didn't mind being cooped up in a dark-ish building. We went in the winter and stayed at a hotel with an indoor pool.
Dutch wonderland is also great fun at 5! We did that in a day trip from NWDC.