Hello! We are heading out on our first cruise in October on the Fantasy... DD is 7 - does she need to have her KTTW card with her all the time while we're onboard, or can I just keep it? While we plan on using the kids clubs extensively, DD will never be roaming the ship without DH or me. Are people using lanyards for their KTTW cards? Or other reasons? Are you buying them ahead of time or do you receive them on the ship? Thank you!