I have not been to many race tracks however Phoenix International was pretty fricken cool after having grown up running around Tucson Raceway Park aka Raven Raceway back in the day.
We were lucky to sit between turn 1 and 2 and the shade in the middle of the day finally found us, however friends of ours sat at turn 4 and looked like lobsters because there are no shades and no seat backs.
Take seat cushions, and if you are going into the pits MAKE SURE to get the "Hot pass" this will allow you into where the garages are.
For a first timer at PIR I had a lot of fun, I do wish the concession stands upstairs offered more then Hot Dogs, Daytona Dogs and Bratwursts though.