I feel like I'm missing something obvious. I'm tracking down the Orb of Thralni thieves, I've got the boat, and I'm trying to get to the water-facing entrance of their tower. Apparently I'm supposed to go around the island and come up to the tower between the two rows of rocks?
The problem is I can't find a path through the rocks, no matter what I try. The way to the water-facing side of the tower seems to be 100% blocked. I've tried landing on the island and entering from another side, but all of the doors are locked. I'm stumped. Any ideas what I might be missing?