It might be an okay idea to upgrade your brake fluid, but I've done track days for years without that. Depending on how many turns, and how hard you're braking, you'll likely not even come close to boiling your brake fluid.
Most first time track students don't even come close to using the braking potential of the car. If you're driving an SRT, you likely won't need to change anything; as indicated, I've done track days for literally decades and it took three sessions before I could pull a full g on the brake smoothly and still set up for the turns properly in my SRT.
Get plenty of rest the day before your track experience. Depending on how many sessions and how rigorous the course is, you'll see as much as a 30% to 50% student drop out by the fifth session if you're running that many. A large oval course isn't demanding; a full blown road course is very demanding.
Most people find themselves exceptionally tired at the end of the day; great idea to either stay nearby the night after the track or have someone else drive your car home.
Most tracks require a safety inspection of your car, if not, the session may not be that rigorous; you'll have a ton of fun regardless.
As you go through the sessions, pace yourself. Don't worry about hammering in the first session; get to understand the track, the lines, your braking, transition, apex and exit lines. Your fastest and most aggressive sessions should be your last two. Dedicate each session to nailing a particular part of the track; if you have four sessions, take three sessions to learn the track and the fourth to hammer.
If you're required to wear a helmet, use your own if you have one. You'll likely need to adjust your seat downward, and if you've never put a helmet on while in a car, you might want to practice that a few times before you get to the track; it's trickier than most folks think. I usually put mine on outside the car.
When you roll to a stop at the end of your session, let your car roll the last few feet. This will help ensure an air gap between the pads and the rotors which will be pretty hot. Pop the hood to help let the engine cool; you'll probably have an hour between sessions, sometimes less.
Arrive with half a tank or less of fuel. You can usually buy fuel at or very near most tracks. Don't bother with racing fuel as it's horrifyingly expensive and does very little for your car. Smells great though... : )
Take everything out of your car you don't absolutely need. This includes your trunk. The less stuff shifting around, the better. If you allow other people in your car, check under the seats; you'll be surprised at what rolls out under full braking sessions and it's a heck of a distraction if something is rolling around-- especially in the drivers area.
Tire pressure is critical; you may want to lower it by several pounds after your second or third session.
If you can hammer your car aggressively, you'll use up something like 1/4 to 1/3 of your tire's life at a single day track session.
Take lots of pictures and if possible have a friend or family person take pics of you on the track. Many tracks will have a track photographer who'll take pics- definitely recommend you link with them; it's an enormously memorable experience.
If you have an SRT, set your dash to show your g meter. That way you can see how you're progressing through the day. Here's mine from the last track session;
It's incredibly addicting. The SRT Experience is fun for those who've never done a track day, but it's nothing like spending a full day in your own car with an instructor. Way different and more interesting (and fun) experience.
Let us know how it worked out for you!!
Photos required too. If you wana use me as a reference ... 
