Be sure to see the Visitor's Center, which gives you an idea of what my fellow grads (certainly not me) have done after leaving the Yard. Then visit Memorial Hall, and see how many paid with their lives. It's a sobering exercise, especially when you know people whose names are listed in MH...
Take a peek into King Hall, especially if the Brigade is there. Stand by to be....... Well, you'll see.
Walk the yard. See the Chapel. Take the tour.
You can eat in Drydock, but if you can swing a mid into inviting you to King Hall, then by all means do it. Just don't ask one with the funny white hat with the stripe on it. He won't be able to help you.
If you can get a Mid to walk you through the Lab Decks, your jaw will drop. I graduated from the flippin' place, and every time I go down there I long to be a Mid again...
So you know, I first heard of USNA at your age. I never looked back. Go for it, but remember: it's a horrible place to be AT, but an AWESOME place to be FROM!
BEAT ARMY!
ETA: Here's another bit of advice from what to you is an old man, but really isn't....
Starting today, RIGHT NOW, never again be "good enough". No. From now on, EXCELLENCE IS THE MINIMUM STANDARD. Nothing less is acceptable.
Don't try to just pass. Try to max it out. Don't shoot for a passing score, shoot for a perfect score. Never slow down. Never lose focus. Be the ABSOLUTE BEST YOU CAN BE at EVERYTHING. Let no opportunity pass you by because you're busy dreaming about the future or of a boy/girlfriend or hanging out with friends. No compromises, no retreat, no surrender. You must start NOW.
Why do I tell you this? Because I didn't listen when I was your age. Sure, I did OK. Heck, I've even graduated, served, and made a decent living after life in uniform, but it look back and I'm almost brought to tears at the number of times I could have been better, which would have made my life easier. It also would have meant that I would have gotten to do what I REALLY wanted to do after graduation instead of having to do what was left.
I've been out of the Navy longer than you've been alive, and I still carry those regrets deep in my soul. Don't be me.
Go get 'em.