Yeah but compare the San Diego metro area just a little south and it’s overwhelmingly full of green space. I live in SD proper and there’s several open space parks within walking distance that are measured in the square miles with tens of miles of trails each, not to mention the recreational parks in every neighborhood and kids parks that are every few blocks. The suburb cities in the county have even more open space and the center of the city has a large central park as its primary feature.

YMMV significantly depending on the specific metro area. The suburbs of Seattle like Bellevue and Richmond were like that too - full of large parks and natural reserves everywhere.