https://goo.gl/maps/djClZ this seems to be what you want, I think. I've never used google maps before, but your instructions seem to be correct. I'm only offering the 715 route vs Natural Bridge and Nada Tunnel route as an alternative. There are so many good roads, and places to see, throughout this area that I don't think I could make one single route that would have all of them on it. I LOVE Natural Bridge St. Park, my wife and I actually spent part of our Honeymoon there! I've been back several times since then. BUT, in order to really enjoy the park, you have got to be willing to hike. It's not a drive/ride through park. It has a nice lodge, with a good restaurant, and several rooms to stay in. But you really cant see a lot from it. It's a 1/2 mile steep hike up to the top of the Bridge, by the shortest route. Not something I'd like to do in M/C boots. There is a sky lift (think ski lift) that will take you up there as well, but you've still got to walk from the end of it to the bridge or to take in any of the scenic overlooks. Miguel's is a very cool place and great pizza, very eclectic atmosphere. The road to the tunnel is nothing great, but the Tunnel is very cool....and dark....and wet....and you rally cant see anything. Anyways, if you go around 715 it will take you down and through the Gorge itself. When you get to the far end 715 will intersect with 77. if you go left there and go about 2-3 miles, you will come to the tunnel. If you really want to see the tunnel, and go through it, you can. Then turn around on the far side and go back up 77, if you want. There are lots of ways you can do everything, if you are willing to just do some circles. The whole 715-77-11-715 circle taking in all of that.....715 through the Gorge, Nada Tunnel, Miguel's, Natural bridge St. park, 11 back to 715....is only 33 miles long. You're going to have to make decisions as you go along and see how your time (and stamina) works out.