ditto andys. For non-orchids, Kartuz might be interesting.
In the other direction, Santa Barabara has quite a few wonderful destinations. (sborchid.com, cal orchid, lotusland...).
Huntington Library has a nice new conservatory and extensive grounds. There's another around there that I haven't been to - Descanso.
oh, hey, guess what. I have some photos.
Huntington
lotusland (santa barbara, tix required)
friend's
photos from Santa Barbara Orchid Estate (SBOrchid.com) and CalOrchid and an orchid show in SB, and
more