What up Kyle,
I attended Bonnaroo this year. N i got to say it was a amazing experience that i will be going to next year haha. First, i suggest that you bring roughly around $400. As i remember correctly tickets are 250 then you wanna throw in $50 for gas and $100 for spending (Bonnaroo is not cheap). Second, do not stay at a hotel/motel you do not get the whole Bonnaroo experience if you do that. It was fun to get to know the people camping next to you and get drunk with them. Third, bring 4 days worth of food, water, and cloths. Fourth, bring a camalbak. They do not allow you to bring in any beer or liquor in Center roo (where the bands play) so put your liquor in the camalbak and enjoy. Fifth, BRING A LOT OF BEER AND LIQUOR VERY ESCENTIAL! Also, it would not hurt to bring a pong table along if you have room. It was a great way to bring hot girls back to the tent ha. Sixth, bring some portable fans along. It is very hot at Bonnaroo so that would be a very smart move on your part. This trip is going to be beneficial for you, you will remember it for the rest of you lives. Although, you are going to wanna go back next year and probably the year after that. HELL I AM!