Upvote:2
Several off beat attractions spring to mind
In Sanfrancisco the Russian museum
http://www.atlasobscura.com/places/museum-of-russian-culture
In Sandiego the botanical gardens are really great with a very peaceful atmosphere
I also love Sandiego zoo, which is world famous, but is a traditional tourist destination.
And in Vegas you have lots of choice of weird and wonderful, but my three favourite places
The atomic testing museum
http://www.nationalatomictestingmuseum.org
The museum of erotica
http://m.eroticheritagemuseumlasvegas.com/#!About|about_page This link might not be super work friendly!
And. The parumph valley vineyard.
Have a great trip.