Trail's End doesn't take PSs. It's first come first served. We're usually there right when it opens, though, so it's never been a problem for us.
You can take the boat from MK to FW. When you get off the boat dock, it's a short walk (just go straight) to "downtown Fort Wilderness," where you'll find Crockett's Tavern, Trail's End, Pioneer Hall (Hoop de doo), petting zoo, etc.
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