I toured on a sailboat several years ago. We'd anchour offshore and then dingy in. There were always the usual 'warfrats' hanging around the dock, looking for something to scoff. The skipper would find the natural leader and offer him $10 US to look after the dingy. Once it was agreed on, he would tear the bill in half and let him that if everything was in order upon his return, he would get the other half. In our Caribbean tour we never had a thing stolen and we never failed to have to give the other half of the 10.

I prefer the dirty laundry ploy though.