A taxi can pick you up at the airport or you can rent a car (AVIS or Enterprise) in Yarmouth.
By Ferry:
The CAT ferry from Portland to Yarmouth (crossing ~5 hours. Drive from Yarmouth terminal to the property is a short 25 minutes.)
The CAT ferry from Bar Harbor to Yarmouth (crossing ~3 hours. Drive from Yarmouth terminal to the property is 25 minutes).
The Acadia Ferry from St. John, New Brunswick to Digby, Nova Scotia
(crossing ~3 hours. Drive from Digby terminal to the property is an additional 1 hour 20 minutes).