[slima]

I have a couple surf and boogie boards within that radius. I could set up a surf shop down by the beach!

Food would be kinda scarce. There's an avocado tree, several orange trees and a lime tree that are in the 50'. Some seeds for a garden, but not a lot. Fishing would be really important.

I'd have electricity! Plenty of equipment to set up a water wheel harnessing tides flowing into/out of a lagoon, and/or wind turbines. Use the motor out of the power tools as the generators. I'm sure I could get enough juice to have some lighting (even if it's just LEDs), maybe even cooking, heating, and desalination of water.

Some form of desalination would be important I think, though there is a "river" nearby. Not sure how dependable it is though.

Supposedly the Kumeyaay Indians were very friendly, so I think it'd work out pretty well.