I see on their website they offer organized day trips to the city. All it says is "see the concierge desk at your Disney resort" this implies to me that I don't need to further book anything or do anything until I arrive at my resort and say I want to sign up for one of the trips, is this correct? I just want to make sure. I tried e-mailing them to ask if I needed to let anyone know ahead of our trip we want to do it but they replied and said they could not answer this question through e-mail.