Congrats on your success! I live in the Bay Area as well and found that Mt. Diablo is a nice practice day hike with about 3300 feet of gain. Also Clouds Rest at Yosemite from the Valley replicates well the distance and total elevation climbed (about 20 miles and around 6000 feet of vertical). It's a 4 hour drive but worth it. Another option is to find a nice loop course that will let you bag several peaks (or do the same one over and over) in order to get more vertical with your distance in one training session. Finally there is always the treadmill. Set it at 15 degrees and go at a fast walking speed. Take a short break every hour to replicate actual procedure on the trail. Even strap on a pack if you can.
