Our first trip after buying a BWV resale was also to VWL and we loved it! It's a beautiful resort and there is a lot to do there. You can rent a bike or a surrey bike and ride along a paved trail to Fort Wilderness and you can rent a boat and explore the lake. You can even take your boat across the water bridge all the way over to the Magic Kingdom. You cannot dock there, but you can enjoy the view of the castle from the lake. Whispering Canyon Cafe is a fun place to eat and the pool area is very scenic and we enjoyed watching the geyser from the hot tub! If you enjoy having an adult beverage out by the pool, try a "Lumberjack" from the pool bar. It will make you forget all about the problems you had with your renter!
As far as buying the DDE card, call and order it first thing tomorrow morning and there is a very small chance it might arrive before you go, but it's very tight. However you can ask them to leave a temporary card for you at Epcot's Guest Services (or is it Guest Relations?) outside the main entrance to Epcot. That's not exactly convenient, but it's better than not having the DDE card at all.
Have a great time!