Having some snacks with you is a good idea.
This is where I jump in...
I've had a lot of trouble in the past with such issues as getting enough to eat, having the type of food I'm likely to eat, affording eating out, and getting indigestion from the extremely abnormal sleep and activity schedule that most people adopt during con weekend. Here's my advice:
1. Bring food that you can grab and go. Stuff that requires preparation will likely be eaten last, because there's
always something cool going on that you will want to rush to your first year.
2. Bring stuff that is somewhat nutritious, BUT...
3. Make sure the stuff you bring is not drastically different from your daily diet. Even if you bring apples and carrots and bananas and cold cuts, it may throw off your body chemistry, especially if you do something demanding like go to the dance or play lots of DDR.
Also, as a gamer, I'd bring my memory cards. That way if you have something unlocked that we don't, you can help out, and the other way as well. You can grab a save of a game you don't have yet, and you can have it all opened up once you get it.
I did that once. Drive-by memory carding.
They were playing Soul Calibur 1 with no unlocks. So I ran back to my room, got my mem card, gave it to them -- they stuck it in, loaded it, pulled it out, and gave it back. I understand they used the save all day.
Oh, and one final bit of advice:
SLEEP.
Sure, stuff happens late at night, but it's the stuff during the afternoon, evening, and sometimes morning that you want to be awake and ready for.