LOL! I've been cracking up while reading some of the posts in this thread!
Regarding Hustlers - I found that the first few days in Negril were the hardest. We were pale as ghosts and looking around nervously like blatant newbies. We were fresh bait. The vendors were literally forming a line and coming at us one by one.
After a few days, they knew who we were and waved. We weren't really hassled so much after that.
I found that not always carrying money on us helped make it easier to refuse the offers. I also had to keep my hands behind my back so they wouldn't try to put something in it and use the "Here. You can just pay me back later" line. The easiest to refuse was the drug offers. A simple "No, thanks. I'm not into that. No drugs, just drinking." works. no hassle after that.
It was also easier once we left the Grand Pineapple and took off those stupid AI bracelets. Those bracelets caught everyone's attention and made it impossible to say we were staying somewhere else..... like "The HummingBird" for example.LOL