[EricH]

Some tips:
Use MARTA for distance travel. It's cheaper than renting a vehicle.
Take advantage of some of the special deals for FIRST teams, if you have time. The Aquarium is a good one.
Make sure to wear comfortable shoes; you'll be doing a LOT of walking.
RoboProm. I've never been, but I hear it's good. Talk to 399.
The CNN Center is across the street and has a food court. Follow the stream of teams and hope you can find a table.
The weather could do almost anything. Plan accordingly.
Visit Scholarship Row and the Supplier Showcase. They're right outside the pits.