Bring a chair, it is the only way to stake out space by the main stage. And if you like to dance, well, stay towards the back so you don't bother the elderly chilling in their chairs. Beer and wine is available (last year it was strictly Magic Hat on tap, which I personally adore) and it can only be consumed in the beer gardens. You can bring in water and snacks, though this fest has some of the yummiest local fare around!
Yes, music does stop early, so bring extra cash for the fabulous shows happening all over downtown Newport. You don't have to go home/back to the hotel, but you do have to leave the Fort.