Bring lots of $$$ cuz they don't let ya bring in your own water. And beer is friggin crazy expensive.
Now, as far as your refrence to beating up on Radiohead fans.....make sure to bring a big fuckin stick. Better yet, ya may be safer not bringing it unless you want me to break it off in your ass! (Everything in its right place + good tab of E + lots of pot = best trip I've ever had)
