We have a 4 day trip starting Jan 11th. In the past, I've always bought park tickets well in advance. Years ago it was so I could make fast pass reservations and more recently so I could make park reservations. Is there any reason I should get them in advance now? The one reason I'd like to wait is because last year we had a flight cancelled and missed a day of our trip but I'd already purchased tickets and we ended up paying for a day in the parks we couldn't use. If there's no reason to get them in advance I'd rather wait until we arrive to purchase them so I that doesn't happen again. Am I forgetting some reason to have them 60 days out or so? Thanks!