J.S.
We did a space them last year old for my 6 year old son. I made a solar system cake that went over wonderfully--I baked cakes in different sized glass bowls-when you flip them out of the bowl, it makes a perfect half circle. I set them out on a huge board which I had spray-painted black with some white spots scattered around (stars). Some colorful icing on the top of the planets. The kids loved choosing which planet they wanted to eat.As for the party, we had Mad Science come out and do a program for all the boys (we also had almost 30 boys!) It was an awesome program-lasted about an hour-and-a-half. The boys had a wonderful time--I still hear about it almost 2 years later. While not exactly a budget friendly activity, it was wonderful and my son loved it! We used the party instead of a big gift from us. He realized that this was his present from us and enjoyed it as much as any toy we could have bought him-plus, he got 30 gifts from all his friends, which was way more than any 6 year old should have.