The last night of a summer cruise is bittersweet. Food lockers are diminished, dirty clothes exceed the clean, and there’s relief in not having to choose another safe harbor for the night, but the freedom from land cares also soon will end. For Tom and me on Ora Kali, returning home means a final sail out of the Gulf of Maine and into sheltered Frenchman Bay. On the last morning of last year’s cruise to Penobscot Bay and back, we dropped the mooring at Southwest Harbor at 0945 with just a few high clouds, wildfire haze obscuring the heights on…