Hi! I have a question about pin codes, does anyone know any details about the 20/30/40 pin? For instance once you have the pin are there certain things you have to have to book with it? (Tickets, certain number of days) Or can you just book room only. Also if it were between the 20/30/40% pin and the book 4 get 3 nights free which would be the better deal? (supposing you were wanting to stay between six and seven nights) Thanks for your help!