It's very unlikely you saw a B-29, more than likely it was one of the three bombers that the Collings Foundation is bringing around on it's latest Wings of Freedom tour as has been mentioned above. They've been to Laconia in the past and now also bring a two seat P-51 Mustang along that you can ride in and even fly a bit. It's not inexpensive...
https://www.collingsfoundation.org/flight-experiences/