Central America
Great advice, Questor...
I can only speak with experience regarding Costa Rica, but one thing I did learn is that gringos travelling there are viewed as "rich", comparatively speaking. Therefore, for the criminals, you are a mark upon being sighted. It's really no different than going anywhere else. I wouldn't walk through downtown Toronto waving a wad of cash around or flashing a Rolex, either. Common sense is the key. Having said this, I found the people in Costa Rica to be very friendly for the most part, but they move at a slower pace (especially wait staff) than we are used to. My very limited Spanish wasn't a big problem.
On the other hand, I ran into 2 guys from New York who were staying at the Del Rey Hotel (the ground floor of which contains the Blue Marlin bar, where the SP's congregate). At breakfast 1 day, 1 of the girls (for no apparent reason, they didn't know her & vice versa) came up to them & started shouting "Osama-yes, Bush-no". Not the smartest thing to do as these New Yorkers were a NY firefighter, the other a New Jersey cop. Apparently, security picked this girl up and literally threw her out on her ass before these guys could get to her! I didn't see this myself, but got it from these 2 guys. Still have a hard time believing anyone could be so insensitive, stupid or __________ (insert other adjective here)