I'm not sure about Maine, but depending on your tolerance for day trips??? (coming from me, who a fun day trip is leaving at sunup and getting home after dark!) and of course if you like doing touristy stuff

You're just under 4 hours away from the New Brunswick border (Calais/ St. Stephen crossing). There's the Ganong Chocolate Factory (read: tours with free chocolate ) in St. Stephen. Then about 15 minutes away is St. Andrews, a gorgeous little seaside town. Besides all the small-shops shopping (at Canadian prices, no less LOL) there's the Kingbrea Gardens and the Marine Science Center/ Aquarium.

Regardless, I hope it's a fun trip. The beach house looks wonderful!