I'll be in Edinburgh in early September. Are there particular sights I should plan to book tickets for well in advance? A good portion of my broader trip is focused on hiking and/or part of a Rabbie's tour (already purchased), so I don't have a lot to pre-book. Maybe Stirling Castle, Holyrood Palace, walking tours, but I'm not sure how far out I should be planning for a September trip.
Also, if anyone has taken a Harry Potter walking tour in Edinburgh, which one do you recommend? I was looking at the Potter Trail, has anyone done that one? It's "free" but of course they say tips are always welcome!