Glitching around on Black Pearl Island. See video here:
http://www.youtube.com/watch?v=xz8_pJIfyhA
This video can be discussed at length at the
BB Island thread.
At the start of a boss battle, a chat window glitch seems to cause it to lockup sometimes. When this happens, you get to see a black screen (after the "funny" cut-scene.) You can hear your weapons, and other's weapons. If you press F12, you can see where you are, run around and glitch into harmless stuff, while exploring. If the person that got you stuck presses F1, you blink onto the normal boss battle, right where you left off.
In this video, I glitch inside some of the new buildings on Black Pearl Island, then swim over to some of the forts for a grand tour, showing cannon positioning in them. If you're smart, you can use that knowledge to your advantage. Some forts can't be glitched into, at this time...when my avatar was jumping in an attempt to get in for a longer tour of the different forts, it progressively slowed my movement down. After pausing the video recording at the end, I continued swimming for a half an hour, never reaching the final two forts.
Throughout the video, you can hear "snick" noises of people trying to communicate to teleport to me. Toggling F12 does not let me see what was said during that time, of course, nor who was trying...it just restores the black screen.
Of the first three forts, the left (#2) the middle (#3) and the right (#1) have 6, 2 and 6 cannons, respectively. Fort #1's cannons half point to the left...those three cannons cannot hit the Black Pearl until it moves away from the frigate battle. (So don't move out, until fort #1 is dead.) Fort #2 has cannons facing "in-harbor" and "out-harbor" so if you try to run past, you get blasted fiercely from behind.
Enjoy the tour!