The honest and trusting nature of the citizens. 3 quick examples, spread over a dozen years:
1) paid a $1000 guide bill with a US check.(OK, that was a long time ago)
2) had a $400 dinner bill, only to find out no credit cards accepted. That actually happened twice, and both times was told just to come back tomorrow. In neither case were we "regulars"
3) came in on Tropic, and was anxious to grab a cigarette. In between the getting my checked luggage, and a taxi, I left my carry-on sitting on the curb. Didn't realize it 'til we got to the hotel. Went back to Tropic, and asked. Guy says he saw it sitting there so he locked it up.

Flyfishing my way through mid-life crisis.