We LOVE the Discovery Cube. Personally, I think it is best suited for elementary-school kids, given the science concepts that are the focus of the exhibits, but my preschooler is obsessed with the OC location, and it has been one of the better memberships we've gotten since we end up going there almost every week. I also think it has gotten better and better over the last couple of years that we've been going. The new touch tank with rays and sharks is a special favorite, as well as the lunar rover remote control cars, the laser maze, and the build-your-own race car tracks. My preschooler also loves to get soaked at their awesome water table (so bring a change of clothes if this is your kiddo).