The Golden Mile Stamp Mill Trail is a good pick for a quick hike, especially if you're pushed for time.
This easy but uphill trail begins at Tinhorn Creek Winery and follows the edge of the vineyards to the end of the property. Climb over the snake fence and then choose to follow the creek to the remains of the old Stamp Mill (left) or head up a steep section of trail to an amazing viewpoint.
After taking in the incredible valley views from the latter, you can continue further along the ridge as desired. After the hike, consider a tasting at the winery ($15).