If you want a cabana, you can book that now (assuming there are any left). My dates changed from March to July, and I had to cancel spa, luau, some restaurant reservations, kids club, private portraits, etc. Have to wait until 30-90 days out to book most everything else, depending on the activity. There might be some excursions that let you book further out, but based on how my husband already moved our dates once, I am not booking those less than 90 days out either.