Recently, an anti Sit/Lie activist created and placed public benches around the city. These guerrilla benches are made out of recycled wood pallets, and come with a manifesto wheat-pasted onto a nearby utility pole.
Interestingly, San Francisco’s sidewalks once had public benches. But they were removed a decade ago. Why? Well the reasons sound very familiar if you paid attention to the Sit/Lie arguments: homeless people and drug addicts used the benches. (I guess the next step will be to remove the sidewalks, since homeless people have been known to use those.)
Anyhow, if you’d like to use a guerrilla bench, there is one by the abandoned building at 15th and Mission.