Starting from the gas station about a mile or so from the village on the way out of the valley (there is/was a big car park here next to the Sunnyside and climbers campgrounds), proceed back up the valley, using the off-road trails, round the back of the Visitor Center and the Awahnee Hotel, and on up Tenaya Canyon, past Mirror Lake to the Snow Creek trail (I often refer to this as the Tenaya Lake trail in the photo descriptions.) Climb out of Tenaya Canyon on the Snow Creek trail, up the east side of Basket Dome. Make sure you pause long enough to look back across the canyon to Half Dome as you get higher. Fork left at the trail junction in 2 miles to go round Indian Rock (a diversion here up to the rock itself is well worth while.) At the cross trails, take left to Indian Ridge and North Dome. (Diversion down onto North Dome.) Drop down off Indian Ridge, across 3 creeks (un-named, Lahamite and Indian Creek), then out through forest to Castle Cliffs and Yosemite Point. Cross Yosemite Creek at the top of the Upper Yosemite fall, fork right to Boundary Hill where left up through the forest again to Eagle Peak (well worth another diversion.) After returning to the trail from Eagle Peak, continue on to the summit of El Capitan (about 3 miles.) You must divert here down to the top of the rock face of El Cap. Back to the trail again and left over Ribbon Creek to Ribbon Meadow. (You will need to follow the 'ducks' over some of the bare rock around here.) From Ribbon meadow you have a long easy descent of about 4 miles to meet up with the Old Big Oak Flat Road (or what's left of it) near Cascade Creek. Left on the old road is a very pleasant easy walk for some miles past the old Rainbow View lookout point (still distinguishable) until you come to the zig-zags (or where they used to be.) Rock slides destroyed the zig-zags and closed the Old Big Oak Flat Road for ever in 1942, fortunately just after the new road had been completed about 1940. You have to scramble over the rock slides aiming lower down as best you can for where you think you might pick up the road again. Actually there are two rock slide areas with a short bit of road between, and it's not as difficult to locate the road at the other end as you might think. There were telegraph wires along the road and these are still visible in places among the tumbled rocks - follow the wires if you can. After the rock slides (which can be very hot in the afternoon sun) it's an easy cool walk down through the trees to the valley road, and (unfortunately) a half mile or so of black-top to walk to reach the gas station and parking lot. I haven't measured it, but it's probably a little more than 30 miles. It's a great walk.