That is if you book a package through Vacations by Marriott (Neat Group).

You can book this rate by using the publicly available S29 promotion code when booking your room for yourself. Just make sure not to select a Sand Dollar package that includes flights OR a rental car as all bookings with flights OR a rental car go through the Neat Group (that is who does the Vacations by Marriott packages).

See Vacation by Marriott page here: http://marriottpackages.neatgroup.co...ramework=true#

See full T&C here: http://marriottpackages.neatgroup.co...ramework=false

Now that didn't answer the OP's original question do you get 3 or 4 nights credit; for which I have no answer or insight other than to say you will get one or the other.

My personal recommendation (not that anyone asked for it) is that people not use Vacations by Marriott, AAVacations, United Vacations or other such thrid parties as they usually have different and quite often worse deposit, change, and/or cancellation policies.