Provided you have a valid cruise booking number and have met all deposit requirements for each guest you are booking shore excursions for, you can book shore excursions online beginning 120 days before your sail date. Keep in mind, unless otherwise noted in the shore excursion description, you will have until 3 days prior to sailing to make new shore excursion bookings. If you would like to purchase excursions after the cut-off date, you will need to do so once onboard. Some excursions have a limited capacity so booking early may ensure that the excursions you want are available.