The parking lot where we often meet is located at the North end of the Marina Green where they play volleyball on the weekends. It is adjacent to the St. Francis Yacht Club which overlooks the Bay.
The coordinates are Lundeen and Mason Streets, where they meet at the entrance to the Presidio from Marina Boulevard, just a bit north of Baker. Driving northbound on Marina Green, turn right immediately before the line of tall trees separating the Presidio from the Marina. This is on Yacht Road (however, there's no sign that says Yacht Road, but that's what it's called on the Mapquest Map at the link below. The parking lot is where the word "Yacht" is.).
If we agree to meet at 7:45 a.m., we actually start walking at 8:00 a.m. You can catch up, but it's better to arrive early to stretch, shake out, and rub the cobwebs from your eyes.
http://www.mapquest.com/maps/map.adp?ovi=1&zoom=8&mapdata=p5kqyoo6yZJ%2b7ApoJ14MLBxdsmnZFR2YQptVFHOjgsapVyHs3SU%2bKK0zvP2fRdQCBKLaQ5BkWNNen7%2bvHICuXanHc42G0ZuoG4FA1kNK09VRBWHZREC15Qn%2fQIoVH5iCHqgfs3u3nvmg8ctJ%2bG%2b2iGxACpZvQgmvN94%2bN0rbz%2f70u8eV0kZG75wjfQg2gYi%2b7o8%2fm2rNYGE5KKYuARXTVbkGdQr2YgUVIJD%2bnQfNnH767JIXcJicP7TynM3xjj5iw61xGgqMO2ph%2fzXyREPNJaM21weR4%2bd%2bJbTE3P90tINWycQ%2frTulBj%2f1gHjj%2b%2b6HLl2VaUcQs4ULUxSD21OIr5aA2%2brQWYpR0OxCzVlMv9nwPDBdge2wSr4nVGEKfuQkzqL145j%2bXtq3YSYzHTMSeQ0tMaJqiUM%2fgb3S0Y5RwHoIgbvRkHsbN9eqNEzi5YUfdLQzCXqnYzS76dzHGxhpIgawyy6yB27WT3jo7WWx8Dvbohhez97XTw%3d%3d
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