I hiked this starting by Rocky Point on Hwy 1. Absolutely beautiful hike, I clocked it as much longer than 6.8 miles. Granted I did stop at the Stinson Beach market and got a little lost at the top of the Matt Davis trail but still ended up at about 11 miles including walking up (and back down) from Steep Ravine cabins. It was challenging for me but I would do it again in a second! Make sure to bring plenty of water, it was super hot and sunny up top. From start to finish back to Steep Ravine it took me 4 hours.