Local People seem to be more friendly when im on vacation.

I've traveled all over the U.S. and Canada and rarely encountered any people who were openly hostile. At least face to face, road rage on the other hand is a whole 'nuther issue. I've also encountered the same thing as described by DFX 340 where I walk into a restaurant and every single person turns to look. Then again being 6 ft 7 in tall I don't exactly blend in with the crowd in most places.
I've always found that if I can be approachable with a smile it makes it easier.