I'm in San Diego, and grew up here. Open space. Yeah, we are really good about keeping some open spaces (typically national/state parks) but just random open space is all filled with urban sprawl now.
When I was a kid, there was an area of San Diego county that was a GIANT piece of private property. There was one dirt road that ran through it (likely an easement/eminent domain thing), connecting the east and west part of the county.
Decades ago, when I was in high school, we used to party, and do all kinds of dumb shit out there. It had been the same for so long that my parents also partied back there too many, many decades before. I know there were at least 2 cars buried out there. I had gotten a car stuck in the mud once myself (had to dig it out in the dark. that was super fun) It's all but gone now.