A lot of teams do choose to fly, if so it may be a good idea to bring a copy of this
http://www.usfirst.org/uploadedFiles...obotLetter.pdf
As a frequent volunteer, i recommend that this short time between now St. Louis is a great time to go through the inspection checklist for both hardware and software, it can save hours of panicking on Wednesday for a few minutes today.
While this is a competition, don't be afraid to ask for your neighbor for help or a tool you may not have (or cannot find, i have done this one many times).
During some downtime its a great chance to check out some of the other areas like FRC, the other division of FTC, FLL, and the vendors, for Jr's and Sr's its a good idea to check out Scholarship Row (your parents will thank you).