Not as easy as it used to be Bob, The internet has tightened up non work visa entry. However with a specialist knowledge you might be on to a winner. They keep asking me to go back, but my days of weeks on the road are well over. 5 days is as much as I can do nowadays, and then I end up looking like a stand in for Quasimodo with the state of my back. Brian Peters is the man to ask (about US I mean not backs). It would be wise to borrow or hire a guitar over in the states, you stand a chance of having a guitar to play at home and not a pile of firewood courtesy of the airline.
Bud Manning (Buds Records) is a good contact, he will advise you on clubs and house parties.