The Keeper's House at Isle Au Haut is a B&B Inn.  We have heard it is a great adventure to stay there.  It is a bit expensive for us, as all our money goes to travel to lighthouses. 
 We did stay at the Keeper's House at Heceta Head Oregon this summer
 (2000, for Bob's 75th birthday) 
 It was a GREAT adventure.
 Not to mention that 7 course breakfast is out of this world. 
 Don't go if you are going to stay on your diet.