They have a really excellent collection of artifacts and information, including a full-sized reproduction Egyptian tomb that they give tours of several times a day.
They've also got a planetarium where they do various fun shows. The one we saw was on the Mithraic Mysteries, an old Roman mystery cult. There have been many theories about what all of the weird murals in the Mythraic temples meant, but there's finally a good one that seems to make basic sense by a fellow named Dr. David Ulansey. He could still be wrong, obviously, but his theory makes a noticeable amount of sense, which is apparently an improvement over previous attempts.
So yeah, definitely an educational weekend between the Egyptian Museum and MBARI. And thanks to dangerpudding for posting the information about the MBARI open house!