Where else do you go.
Well, if you're GYS, you just fly high enough. The LA basin is about 50 miles across and completely full of housing and buildings. My plane has a pretty decent glide ratio, about 12:1, so GYS would just fly at 50,000 feet. Simples. Or in the Pitts, with a glide ratio of 3:1 on a good day, at about 200,000 feet. It just takes a bit of simple arithmetic...