Hey there! I'm pretty much a newbie to anime conventions, but I'll share my two cents...or seven I guess...o.O
1: This will be my third year
2: My favorite thing has to be the community. I've only been to one other convention, so I don't have a lot to base it off of, but everyone at NDK is great! You can approach almost anyone (as long as you're not a creeper ;P) and start a conversation. Most everyone is always open and friendly, and always showering praise on any costume you bring. Just a great, warm-fuzzy feeling! I've also never seen a hotel with an atrium (I don't get out much

) so all of the decoration is just....for lack of a better term...awesomely nerdy.
3: Honestly, I'd set a benchmark to at least talk to five random people you don't know. Again, this community is awesome, and who knows? You might make a lasting friendship.
4: Uh...I'm not really into sports, so I can't answer that....<.<
5: CHRIS PATTON! Hands down, no contest. His panel was always amazing (I'm going to miss him D:) and his humor was great. Also, he's not really...stuck up I guess....like some other voice actors I've had the displeasure of talking to. 5 minutes into a conversation with him, if he has the time, and you feel like he's a friend you've known forever. Really great guy.
6: I've never met Vic Mignogna, and I have a huge man crush on him, so I literally did a man-squee when I found out he was attending this year. I also really like Mary Elizabeth McGlynn, as I'm a huge GitS buff, so another man-squee was had.
7: IT'S A SECRET! But I am returning with my Zero costume, from Code Geass, just because I love it so much.
I hope this helps!

Have fun, and see you in September!