There's some great beach to fish right at San Onofre/San Clemente. Look up fliflicker.com for some great info on flies, techniques and a good message board. I fished it on vacation several times with my 6 wt and had a blast. There's some inland lakes about an hour away where you can rent a boat for a reasonable rate (40 a day) and fish for stocked rainbows and warmwater species.

Charlie