Mariposa Loop in Briones Regional Park near Lafayette. Park near Happy Valley Elementary School and then head up Panorama Drive to the top to get the trailhead. It's just over three miles. The first mile goes up 600 feet without stopping and the views are fantastic in every direction. This is the first time we've visited Briones, will be back soon as it looks like it has a lot of decent loops.
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2.94 miles, 783 feet total elevation gain (estimated from GPS track).