*Follow #esriUC on Twitter to help meet other ans hold onto tidbits gleaned from the plenary and other discussions. Don't have a Twitter? get one, then create a list of organizations and people you'd like to meet at the UC. Alao, respond to presentation you like via twitter if they give a handle.
*Have business cards - if you're a student, go Vistaprint, its cheapest.
*The bus ride to and from ESRI is a great place for conversations. If not, find events after hours on Twitter and so on to meet new people.
*Introduce yourself. Often. Go for it. Even if they look distracted. GIS people are the nicest, I swear.
Go outside at least once a day - Get your vitamin D!
*Plan downtime if you can't handle large groups of people. The Lounge is good.