http://www.jakesdelmar.com/ - right on the beach and decent deals if you can catch "aloha hour"
Also, if you want to venture up into Del Mar Heights there are a couple of new places in the same center:
http://www.burlapeats.com/ - overly trendy and can't speak much to the food, but a good looking place in every sense.
http://www.davantidelmar.com/ - good wine and small plates.