Tips for Air Travel, Very Long Flight!?

In 2 days im going on continental airlines for a 15 hour flight from newark airport(ewr) to shanghai pudong airport(pvg). My flight number is co87 and is a boeing 777-200er flatbed. I would like to know what I can do to make 15 hours on the flight pass. More info is that the flight departs at 11:00 right before lunch and arrives at 2:00 in the afternoon in china