I had to attend some meetings in San Diego earlier this week, and we decided to make a weekend of it and went down to Borrego Springs for a few days before hopping over the hill into KSEE.
https://www.airnav.com/airport/L08Borrego is an interesting place-- I was there about 20 years ago in my Aerostar, and I can tell you that it basically hasn't changed at all. My imagination is that it's much like Palm Springs must have been in the 1950s-- lots and lots of desert, and a few places to stay. Borrego has very limited water supplies and is surrounded by state park, so there isn't much room to develop there.
There is a great hotel there, though-- La Casa Del Zorro. Owned for many years by the Copley family, who owned newspapers, it was actually closed for several years in the early 2010s before reopening. It's very nice if you like to hang out by the pool and relax-- our room had a wood burning fireplace, which they came and lit each night-- you need that in the desert in the winter!
There aren't tons of places to go out and see or be seen in Borrego, but I really like it. I think I'll be back.
Two things to be aware of-- the airport has no Jet-A, so plan for that, and no rental cars. La Casa Del Zorro will come and pick you up at the airport (it's not far-- you can see the airport from the resort!), and they'll also drive you most anywhere you want to go in town, such as it is.