Hi
I know that there are several diving opportunities in San Diego. A google search would turn up many opportunities.
When I was there, I dived with Blue Escape:
http;//
www.blueescape.com
You can read my diving exeperience at:
http://www.bsac854.org/854/divelog/sandiego03/sd_dive1.html
Not a very good account, because I come from a tropical country where waters never go below 22 degrees centigrade, and I was diving only in early spring!
T.S. Tan