The sentence is grammatically correct, but it would have to be used in the context of at least one other sentence to sound natural. , Because the only time I've been in California was when you were there, I haven't had the opportunity to see as much as I would like to of that state.
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PreciousJonesBecause the only time I've been in California was when you were there.Sam's advice is good. Some, however, would say "is when I was there," the reason being that the situation still hasn't changed so the present is appropriate.