Packages require a $200 deposit, must be paid in full no later than 45 days before you arrive, and have cancellation and change fees that begin 45 days in advance of arrival.
Room-only reservations require a single-night deposit, are not paid in full until you physically check-in, and have cancellation fees that begin five days out. I don't believe there are any change fees. I've always thought room-only was safer and more flexible, unless there's a compelling discount involved in a given package.