irishpilot1990,
You don't need a visa for hour-bulding.
Immigration will ask you the purpose of your visit (business/vacation) they don't want/need chapter and verse but they will want to know where you're stopping whilst you're there - the hotel/motel you are spending your first night will suffice if you're travelling around.
I always carry my headset, logbook and licences in my hand luggage and never once has this been queried or questioned when either arriving or departing the US.
Shop around for deals, many organisations don't bother responding to e-mails (in my experience of the last few months, anyway) so be prepared to pick up the phone and see what the best rate you can get is. I've flown in Florida & California and can't say that one is more expensive than t'other - can't comment on Michigan I'm afraid.
Enjoy the flying
