Earplugs, in case you have noisy neighbors and eyeshades in case your neighbors have bright camp lights, or other lights are nearby.

Also, be careful where you pitch your tent, a flash flood got us the one time we camped there. The ground was very dry and we didn't see the little gully that ran under our tent. Before we got back to our site we had a down pour and everything in the tent got wet from underneath except for 1 sleeping bag. We had just bought a Jeep Wagoneer and both of us slept in it that night. Now, if I suspect rain when I leave the campsite I put my sleeping bag and mat on top of my camp chair inside the tent. The lodge has a wonderful dinner, as we found out that evening.

I also have a mesh bag for carrying my bath stuff to the shower. I second the flip flops for the shower.