I have read and watched thing after thing but cannot figure this out. Everything I can find starts with them on the beach near the lair. We have the diary to gain access, but we cannot figure out how to get to the beach!
We have gone as far north as we can and completely fleshed out the rocks that block us from going down to the beach we can see, We have gone from the lighthouse to the other corner. Killed everything we have seen, figured out the puzzle, and finished the lighthouse.
How the heck do you get down to that beach?!