Take highway 5 northbound and exit on encinitas blvd, make a left turn and go all the way down until you hit the ocean, make another left. From there, go south and to your right you'll find plenty of spots all the way from Carlsbad to Torrey Pines State Beach (north side is the best).
A tip is to park on the side of the road and walk down a bluff area...we usually surf right after Cardiff there are plenty of bluffs to walk down to and generally the crowds won't be there because they are too lazy to explore.
Weekends are crowded for the most part, but weekdays tend to be less crowded especially the big spots like Swamis etc. If you want to check out some pics from summer surf in SD as well as forecasts go to the site below....there is plenty of surf in the summer...but at times you will find that having a longboard helps on the smaller days
www.surfshot.com/