The (free) Discovery Center at Big Bear Lake had tons of fun activities for the kids. There were dead animals to pet, coloring pages, phosfluorescent stones, live animals to look at, a 1/2 mile nature loop and a big outdoor play/explore area.
Sienna became very interested in rocks on this trip.
The kids panned for gold. For $3 each, they got to fill a little vial with the gold they found and wear it around their necks (see further pictures of Dalton on this trip).