Didn't know if you had any sort of prefs (price, cuisine, view, etc). I did a Sunday at Coyote Grill off PCH in Laguna and liked it.
Over in Crystal Cove there's always a line, but the pastry selection is worth it for some grub at Pacific Whey Cafe. Also off PCH.
My personal favorite is in Costa Mesa called Plums. Pacific Northwest at its finest. Pan fried trout and the Dutch baby.