Sorry for the late reply. The club is located about a 4 hour drive southwest of Bar Harbor, so we aren’t local experts and could not help with overnight accommodations.
There is at least one bike shop in Bar Harbor, the Bar Harbor Bike Shop, which I believe is a reputable outfit.
As far as transportation, there is a bus service from the Bangor Airport to Bar Harbor, Downeast Transportation http://www.downeasttrans.org/index.htm.
Good luck with the trip, I hope all goes well.