My advice:
-Meander the pits. Talk to other teams; every team I've talked to has a unique perspective on the game and it's interesting to hear how they approach the game.
-Watch a few matches.
-Take a walk outside (A personal favorite for when I only have a few minutes)
-Fix your robot ASAP from returning from a match
-Prep your strategy with plenty of time to spare before the next match
-Eat and sleep. Mountain Dew does not count as a viable source of daily nutrition despite it's alluring green glow.

Mike