I loved Palm Springs
It's a bit of a drive from LA but Plenty of MCM there and it all feels so natural. PS ModCom provides guided tours, maps et. Also lots of things to see and do in LA. We visited Eames House, Eames Office and Stahl House on previous visits. Plenty of interesting galleries (see DA links) and museums such as LACMA as well.
The Frank Lloyd Wright Preservation Trust
The Frank Lloyd Wright Preservation Trust do a few good tours. Not so much MCM, but just as inspiring. They have an Architectural housewalk coming up in June which looks good:
http://gowright.org/wright-plus.html
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