Hi. I am staying at POR Nov 11th-16th, and just found out about the carriage rides there. It is something I am interested in doing, but have a pretty full schedule already and only have our arrival day open. I have to change flights and will be with my 4 yr old and 5 month old and not quite sure how exhausted I will be. Anyway, is the carriage ride something I can do at the last minute, or can I sign up when I get there? Does it book up quickly? Any input would be greatly appreciated.