I haven't seen much myself and we finished our 6th charter in 7 years earlier this year. The only illegal activity I've noticed is the occasional marijuana deal. I've seen that happen several times in both CGB and JVD (around Foxy's).

We always take care to lock our dinghy. We've never had anything happen but it's better safe than sorry. I did notice some sketchy guys hanging around the dinghy dock at Trellis the last time we were there. I stayed near the dock while the gals shopped. I'm not sure if they were up to something but it looked suspicious.

Keep your stuff and dinghy locked up. Have a great time. As long as you don't do anything crazy, I believe the chance of something happening to your or your crew is pretty low.