How can I prepare for physical activity the day before?

Let’s ignore the fact that I’m on Fluther right now…

Do you have any tried and true methods for preparing for physical activity? I’ve heard that it’s good to eat a lot of carbs the day before, does this work? I’ve also heard it’s good to drink large amounts of water before hand, what do you think?

I’m ill prepared for the first basketball game of the season, I would love to avoid throwing up on the court.