I played soccer all of my life and still continue to play as often as I can. I highly reccomend joining a club team in the area if you want to get really good. AYSO can only take a person so far sometimes.
I used to play AYSO just for fun, and then play CYSO in order to become a really good player...
Stanford University has a really good soccer camp as does Santa Clara University!
Additionally, Tony Igwe has an amazing soccer camp through World Ambassador Soccer Association (WASA) -- if you are really serious about soccer, he is the man who can help you become the best!