Debit card and cash. You can leave a debit card on file with the resort(if it has a visa/mc logo on it). Then you can use your room key to charge back to the room.
Otherwise, you can do what I do when we stay at SoG. I carry my debit card and some cash. I rarely use the cash though. The debit card is just more convenient. Make sure you check your daily limit before you leave! And ask if your daily limit is in effect over weekends! My banks daily limit from Fri-Mon is the same as Mon-Tues. Most banks will raise your daily limt for a trip.