Usually when I checkin at a dvc I give my credit card. But for reasons that would take too long to get into- I would rather not do that when I checkin next week. Is it enough to show my membership card and maybe put some cash on the room? What are my options?
You don't have to give a credit card. When I go with friends, we don't leave a credit card. You don't need to show your member card either. Just photo ID to match the reservation.
The real reason to leave a credit card is for room charging and express check out. If you don't need charging and don't mind checking out then you don't need to put one down.