Here's an idea: don't visit those cities. And tell them why.
Taking a Stand to Keep Sitting Legal
Randall Amster J.D., Ph.D., Truthout: "San Francisco is poised to become the latest in a string of cities to adopt a law making it a crime to sit on the sidewalk. While it is the case that some of these other cities are known as being among the more liberal in the nation (e.g., Portland, Seattle, Boulder, Austin), no city with such a deep progressive history has sought to impose anything like a citywide ban on sitting such as is being proposed for San Francisco."