I'm not sure if this is a known bug or maybe it's just me, but search results haven't come up with anything so fuck it.

I'm 80 hours into the game and I started this quest. Happy and excited, I landed on the island. The bug is immediate. The huge wooden "door" when you land at the island is completely blocked. There's no enterance. I can't get to the ship cutscene. If I go around and approach the ship from the behind,it fucks with the quest system. I tried completing the quest without saving anyone and when I came back, the door had an opening. But of course, I could no longer do any of the quests so it was pointless. Any solution to this?

That's normal. Face the wooden wall and head left. Keep hugging the wall and using your witcher senses. You are looking for signs that somebody dragged a litter, which will lead you to a slipway. Continue until a cut scene triggers. It does not affect the quest.

I spent nearly 3 hours on that...I'm such an idiot. I'm going to play tommorow morning, thank you for the answer!