Hi Dan
I was out there over the fourth of July visiting. They were having an off wind pattern most of the time I was there so 3rd and Alameda were not working. They are like East beach in that they are more beginner spots. Though the quality of the launch is closer to backside. Plenty of mud and a real funky smell at 3rd. I rode Crissy field and can say it is not for the novice rider, but I'm sure you could handle it. It turns on in the afternoon and will blow upper 20s to 30s in the channel under the golden gate, where you can mix it up with the tourist ferries and freighters. The wind dies off near the launch so rig for whats outside not what it is blowing on the beach. The current really rips there so you should avoid ridding on a strong flood as it runs the same direction as the wind and you'll have trouble staying upwind. The local crew were friendly and helpful. Sherman didn't fit into my plans but I here it is a great place to ride.
Here is the link to the local forum
http://www.bayareakiteboarding.com/
And a controllable video cam
http://cams.exploratorium.edu:8010/1/control.html
try preset on GG bridge or windsurfing in the afternoon pacific time
Have fun