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the foothills of Amador and El Dorado counties just to the east less than an hour both have nice oak hills and other scenery, as well as old mining towns along state Hiway 49 (as in the gold rush of '49). There are dozens of wineries, and very good wine, with far less traffic and people than Napa Valley. But if you want to get into the more big time wine areas, I would suggest Sonoma County over Napa too. The town of Sonoma is very nice; one of the original Spanish missions, etc.
To the south of Sac a few miles is the old Chinese town of Locke, and the rest of the Delta. Old mansions, bridges, farms, etc.
Around town, the area of town from Old Town Sacramento (again lot of old gold rush era buildings) to a mile or so east of the Capitol has a lot of old restored residential architecture that's interesting.
You're also 2 hours from SF and the ocean and 2 hrs from the top of the Sierra Nevada mts, so there's always those day trips.