San Diego is “big”, but it’s not dense. It’s the 8th largest city in the US by population, but the 2nd largest city in (edit: in CA) by land area — and that’s just the city of San Diego proper. The city is sort of like an amoeba that grew to reach the other incorporated towns in the county, but density across all the incorporated areas feels similar and it’s appropriate to refer to it all as Greater San Diego. San Diego *County* is absolutely huge, reaching halfway across the state towards Arizona. All of the developed area is in the western 1/3, even the areas locally referred to as East County. If you’re coming from NY, Chicago, or even LA, you’ll be surprised at some of the geography. San Diego is mostly single-family detached homes in a sort of rolling hill, valley, and canyon motif. There are a few places that you’d call “suburbia” and there’s a central downtown core, but most locations are smack in the middle. With a strong neighborhood identity, San Diego is best described as feeling like “a big small town.” We don’t have a lot of big city problems relating to crime (though we do have a very large homeless population), nor the anonymous bustle of a huge urban megalopolis. For me, and many others, it’s a nearly-perfect mix of amenities, attractions, and benefits of a city life — the major industries being military, tourism, biotech, agriculture, and office life — with a relaxed, laid back, and approachable population. The huge desert and forest separating us from the rest of the country helps prevent urban malaise spreading down from LA to the north or AZ to the east, and Mexico and the Pacific Ocean are our other borders. Historically we were seen by the rest of the country as LA’s sleepy suburb to the south, and that explains a lot about how we developed. San Diego’s pretty hard to describe; if you’re interested in it at all, I’d encourage you to visit and find a local friend who can show you around the county. One final note: As a function of our low density, public transit is relatively abysmal compared to other cities, outside of specific commuter corridors. You’ll need a car to explore or get around in SD, so plan accordingly