Wear Comfortable Shoes. Drink lots of water. I usually plan what & who I want to see each day as early as possible. Most exhibits have demos scheduled throughout the day so plan on extra time to see the demos you are most interested in. There are lots of after hours events as well. Many companies and user groups host them. Some have already been announced and others are announced as it gets closer to NAB. Many are FREE and others that do not involve dinner are very budget friendly.
Victor
http://www.editvictor.com
http://www.hbhm.tv
http://www.itvisus.com
