All I can remember about the Jetsons was flying around those buildings. I don't care if you're going for a simple home pin, with that price tag, why not include some stationary buildings that the ramp zig zags through? At least do a spaceley sprockets and the high school or something in the back corners. Maybe the family car/ship on the ramp too.
You don't need crazy toys like the MM castle to fill in all that space. Just make it less 2-dimensional with some stationary items. If it's not immersive, the kids in the target families are just going to walk over to their Xbox in the same rec room.