L.A. has a lot of museums. One of the older ones (which never gets old) is the County Museum of Natural History (dinosaurs, dioramas, birds, rocks, life exhibits). The Page Museum at the La Brea Tar pits has a lot of fossil exhibits and mastodon/mammoth skeletons. The Getty museum has a fabulous art collection, as does the Norton Simon museum. The Huntington Library is a beautiful setting with lots of rare books. There are probably a hundred more smaller ones.