How would you handle this situation?

I'm sitting in the morning daylight outside a grocery store, at a stone table, with my laptop on the table in front of me. I'm fighting to read my screen in the glare of the early morning sun.
The good people of Napa, CA are visiting the grocery store for their provisions for a Sunday. Some buy a paper, fruit, milk, a pastry. Others buy party beer and ice gallore (it hit 108 degrees yesterday). It's not a real ritzy area of town, but most of the patrons are clearly white-collar, or retired, cleanly-dressed with nice shiney cars.