BOOK IN ADVANCE! We'll be there in two and a half weeks and I was trolling about on the website and noticed that nearly all the slots for our window of opportunity were sold out. I'd read that it's not wise to try to book on the day as "they might be sold out a few days in advance" but 2.5 weeks?
I've just squeezed in, but would have been really hacked off to have missed it, so thought I'd share.