well, asides from the basics, bedding, tent, food, cooler, etc. I would suggest going to a camp ground that is close to a city/town where you can go get things that you forgot.
If it helps any....here's my standard camping list (for summer time though).
baseball cap
cheap sunglasses
sandels
shade hat
shoes
socks
clothes (cold and hot)
swim suits
after bite
after sun aloe
air mattress
bedding
bug spray
cards
chairs
coffee mugs
cribbage board
fishing rods
knapsack
lantern/flashlight
pillows
solar lights
sunscreen
tent
tent spray
travel mugs
umbrella
water bottles
antacid
books
brush
deoderant
gum
hand sanitizer
pain killers
ponytails
shampoo & conditioner
soap
toilet paper
toothbrushes/toothpaste
towels
bacon
bread
buns
cereal
cheese
coffee
coffee cream
coffeepot/perculator
condiments
eggs
fruit
hambergars
milk
sandwich meat
smokies/buns
snacks
spitz
sugar twin