I think NCA is as magical as you make it!! I def second everything @aewers94 said!! Clear, thorough, well-articulated arguments are what has helped me (but some other questions stuff is certainly accepted). Best articulating the paper fit is important depending on the division. You may have to do some tweaking to ensure the call is clearly tied to your paper.
I am always in favor of engaging presentations. You only get so much time and people really just want to know the "meat" of your work...so make it as interesting as you think it is! The worst is when someone reads their paper, and it feels as though they are slowly disappearing from the planet!!
The conference can be as crazy or as chill as you make it. I prefer to go to as many presentations and lectures as possible - but I just love all the conversations that occur!
Also, the food. I enjoy eating my way through the city it is hosted!! Because, food? Always, food.