It's been said the best way to see Casco Bay is to take the mail boat run. Not only is it the longest running mail boat operation in the U.S. it's also dog friendly! The Maquoit II is the boat that brings cargo, mail, and passengers around Casco Bay, making stops at 6 of the Islands. The cruise takes anywhere from 2.5 to 3.5 hours and is a perfect way to spend a warm sunny day in Maine.