You should take the Eastern Trail in the beginning, as it is very scenic and nice and flat. It will take you down to west kennebunk (near where I live) and will take you to many possible choices and nice backroads with very smooth pavement and very few cars. One of these roads is branch road, and over the summer I biked the whole road without seeing 1 car. But don't plan on seeing many people anyway, because a lot of the coastal towns are summer towns and are only busy during the actual summer though. Well, I hope this helped, and you can just PM me or reply if you have any more questions about maine or about new york (where I live during the school year).