When you're away from home for so long and have little in the way of scheduled commitments, knowing the day or date largely becomes irrelevant. Even holidays seem unimportant. I should have paid more attention. Egg Rock Lighthouse at sunrise At our shipboard briefing before landing in Bar Harbor Tuesday we were told that, in addition to the optional excursion, we could hop on the Island Explorer bus system emanating from the Village Green, which I use during my regular summer visits, to reach all points on Mount Desert Island. My plan was to bus to one of my favorite spots for watching the tide come and go. But the buses stop running immediately after the Columbus Day weekend, the "official" end of the season in Bar Harbor. If only I had remembered that the Columbus Day weekend was last weekend, not next. My plan to visit my favorite rock and tide pool fizzled when I walked up from the waterfront to the Village Green and saw none of the propane-fueled buses wi...