+1 on the s'mores.
I thought of another thing: some tents come with this, but you usually have to buy it separately: a groundcloth to go under the tent. Most tents have a waterproof tub-style floor so a groundcloth won't keep you drier, but it protects your tent floor from abrasion and wear (it's cheaper to replace a groundcloth than the tent). Any decent waterproof tarp will do; some tent manufacturers make groundcloths whose dimensions match your tent's footprint but those are always more expensive. See http://www.rei.com/expertadvice/article ... cloth.html
for more information.
For your first trip you could get along without this, but if you start camping more frequently it'll make your tent last longer if you use one.
Talking about all this is making me yearn to go on a camping trip! I've mostly done backpacking and canoe-camping. My favorite trips were by canoe, paddling to an island and camping there for a few days, going for a swim in front of the campsite each morning and going to sleep to the sound of loons calling. And taking the canoe out into the middle of the lake late at night in early August, watching the Perseid meteor shower while drinking Drambuie and eating Oreos, the perfect combination of the sublime and ridiculous. There's not much better.