You might try Corky Carroll's Surf School. I was looking into them a while back, when I thought I might try surfing. They look pretty good. I'd give them a call and see if they do a single-day lesson. Kind of looks like it at the bottom of the page, but I'm not certain. Here's the link: http://www.isurfing.com/school/school_ca/corky_carrolls_surf_school.html