We heard about it while watching Mythbusters and thought we should visit. Our tour bus stops right outside and this was an easy way to get to and from. In addtion to the aquarium (which was what we really wanted to visit) we suggest you join a tour into the planatarium.

Tickets are free, but you have to get a ticket for any of the free viewings. Go early as there are a lot of school classes there. A few pics from Steinhart.