This little article from a college paper on places to play chess seems more about using chess as a metaphor for making out. But it seems like a good idea to make a list of places to play casual chess. It could be a list to check before traveling. (Because doesn't your girlfriend just love it when you go to a lovely, exotic place on vacation and you get into a street chess game.)
Clubs that allow free drop-in play can be included. List the country, city, name of the place you could tell a taxi driver or find in a guide book, whether play is serious (with clocks, strong players, for money) or casual, and the usual hours of play. Add comments as you like after that. If it's an obscure place give an address, directions, or a link to a map. When we have a good list here I'll post it to a separate page and maintain it with a submission form.
I'll start with an obvious one.
USA, New York City, Washington Square Park, serious play, including blitz for money with expert-level players, all day until dark. Most are hustlers who only play for money. Rather mangy crowd with occasional drug trafficking, not recommended for unattended kids. Players often move to the nearby Chess Shop or Chess Forum shops to play in winter or after dark. Both are on the same block, two blocks south of the park on Thompson Street. They charge a few bucks for use of set and clock.