i plan to purchase an annual pass voucher prior to my 3/2018 trip, then activate it when I arrive in March, so that it will be good until March 2019, for a trip in February 2019. I plan to book room for March when discounts for that time period are released. (Hopefully later this month?) If an annual pass discount for my dates is released later, and I want to change my reservation to one with the annual pass discount, would I already have to have purchased the annual pass voucher prior to booking with the annual pass discount? Would the voucher have to be activated prior to the booking? When I arrive at the hotel, do they ask to see the annual pass at that point? If so, would the voucher suffice if I haven't actually gone to guest services to activate yet?