A perfect 70 degrees with a nice ocean breeze. Beautiful sunset views. Falling asleep to the sound of waves crashing on the beach below. Seagulls regularly patrolling the airspace above the bluffs and occasionally depositing souvenirs on your campsite. Sounds like a perfect vacation to me.
I would definitely do South Carlsbad SB Campground again. Next year, we're booking early so we can stay for more than one one night. We were lucky enough to get a bluff-side spot, albeit for just an overnight trip. Site 207 was large enough for our two tents, an REI shelter, and our two cars. And there was plenty of real estate to spare. It's only a couple of spots from the stairs to the beach and right between bathrooms in each direction. The bushes on each side give you a good amount of privacy from your neighbors.
When booking, I suggest checking Campsite Photos. They have a photo of every campsite at South Carlsbad (http://www.campsitephotos.com/campground/South-Carlsbad-State-Beach/photos/). Combined with Google Maps, you should be able to find the perfect spot for you.
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