We're on the 13 July 2024 sailing of the Viva out of Athens and I was hoping to use my shore excursion credit to book a ships tours in one of shorter port calls or tender ports (like Kusadasi or Santorini) but there seem to be very few available through the app at this point for most ports, and particularly those ones. Does anyone know how long before the cruise NCL opens the whole range up for booking? TIA