I haven't been very active but am looking to change that. I recently contacted a local Humanist group that has a pretty active social groups with concert tickets / discussion groups and whatnot.
There is a Natural History Museum here (in San Diego - only 10 miles) and it is in a nice park along with a science center and a heap of science related stuff.
Of course there are beaches galore, so it is at least possible if I join one of the few groups I've found that there maybe picnics etc. it might be nice to meet some folks with similar interests!