Probably some of the best/well informed staff and ...

Probably some of the best/well informed staff and volunteers at any museum I've ever been in! Their passion for their work is really refreshing and makes it a bit more interesting! They offer free tours, it's usually listed on the piece of paper they give you when you buy your ticket! Last time I went the line was insanely long, so we ended up buying our tickets online while there and just picking them up right away in the will call line - saved us a solid 30 minutes if not more. They also have two box offices, one on each side of the museum (the one by the Brea Tar Pits entrance is usually a lot emptier).