we were told that you cannot sign up in advance. We signed up after we arrived & it was no problem! Also, it may be wise (if you are wanting to enjoy dinner at the Bayside or 8 Rivers) to make dinner reservations in advance, to ensure that you get to eat where you want before it gets booked up!
Ok I just read Randymon's post and they arent discontinuing it until after we are there (mid July!) I do wish that the mini fridges in every room and room service all day was effective while we were there but since we get horseback riding still I'll live!
If I am remembering correctly, the horseback riding you signed up for ahead of time, like you do for the catamaran. The snorkeling you have to wait until the day of to sign up - sign up at water sports when they open in the morning.
Sad to hear the plantation HB ride is going away - we enjoyed it. But we also liked it when it was across the street.