Bring peppermint oil or cooling gel to massage your feet w/ before sleeping ...
Ear plugs are also a good idea. And, while not knowing where you're from (you might already know), the nights often get really cold; inland climate. So bring a good assortment of clothes for both scorching sun, cold, and -- hopefully not -- rain.
In regard to planning vs not planning, I'd say it's up to you. Some ppl are planners, such as myself, and like to have that frame as a starting point. Those prelimiary plans can still be derailed, or changed, and they usually more or less are. But that way the risk of f ex missing acts you really want to hear is minimized. Some prefer to take things as they come, and only go wherever their nose points at a given moment.
In addition to the above requests, which are highly important indeed, I also ask that you be mindful w/ excessive, loud talking on the dance floor, and if you smoke tobacco, that some are quite sensitive to the smoke & smell.
Either way, I wish you a great "virgin" Fusion!