Congrats to your son, Bigbigote. UCSB is a great engineering school. I have kid there so if you have any questions on logistics etc. feel free to PM me and we'll see if I know the answers -- or better yet, I can ask the kid.
As has been mentioned walking on at any good D1 baseball program is going to be tough. Another option would be club ball. I believe UCSB's team is pretty successful. They also have a really good club Ultimate team.