Not sure about trails, but there's a lot of good road riding out of Fairfield. Head over to Vacaville and up to Napa, etc. There is a lot of open space out there, so I imagine there are also good trails.
And Fairfield is about 1/4 the way between SF and Tahoe (closer to SF).... You would be on your sister's route.
My riding partner just retired from the AF reserve (nurse), and I could ask her more about the base if you like.





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