Here is my camping list:
Tent (Treat tent with seam sealer and spray-on sealer)
6 mil plastic cut to fit bottom of tent - two pieces (one under the tent, one inside on the bottom)
Disposable painters plastic (place this down first, then throw away at the end of the trip), keeps the sand off your tent and groundcloth
Sunshade/raincover
ScreenHouse (optional)
Folding Chairs
Cooler or Fridge
Fan (even when the weather is nice, you need to run a fan in the tent during the day to dry things out some, the humidity is still high)
Air Mattress or Cot
Air Pump for Air Mattress (I use a rechargeable one), electric will work well at WDW campsite
Rain Poncho or Rain Suit
Garbage Bags (The garbage cans located throughout the loop may not be right by your campsite)
Flashlight
Electric, Battery, or Gas Lantern
Stake Mallet
At least 20 ft Outdoor Extension Cord
Power Strip
Alarm Clock
Sleeping Bags and/or sheets and blanket
Pillows
Small Backpack for each person to carry toiletries and change of clothes to shower house
Shower Shoes
Towels
Washcloths
Clothesline
Rubbermaid Bin to put shoes in outside of tent
"D-Rings" or "Caribiner Clips" (Not sure of spelling) I use this to hang my lanterns from the inside poles of my rain shelter and screen house, also good to hang your raingear from.
Plastic Tablecloth if you want to use the picnic table at all
Charcoal and associated cooking utensils if you want to use the grill