Another vote for the 50's! We did Sci-Fi in 2004 with my DH, DS, dad and his wife...I wasn't that impressed. We got a car which was cool for DS, but my dad and the wife were sitting behind us making it difficult to chat. I'm not that much of a picky eater but the food wasn't outstanding in my book. We did 50's in 2000 and LOVED it! Our waitress was soooo cute with DH making him leave to go wash his hands and giving him a sticker as a part of the "clean plate club". It was awesome!
Both are unique which make them interesting...we're doing 50's again on our next trip!