Great BIG "little" town. A bit of the suburbs of Oakland, San Jose and San Francisco, Pleasnton is right in the middle of CA's lesser known wine country, The Livermore Valley.
Home to many of the bay area's sports figures, it has grown from "one horse town" status to a very upscale community. In the west Pleasanton hills, you'll be hard pressed to find a home for less than $1,000,000.
BUT there is still a (wonderful) tack store in the middle of downtown and you can still ride your horse down town. Unfortunately though that sight is getting much rarer.