Mount Desert Island is an excellent area for spring and fall bird-watching, too. Many varieties of warblers arrive and depart—a tough test of your ability to distinguish species!
Read MoreIf you want to see sights like this—a great white egret flying by last July—consider a summer trip to Maine's Mount Desert Island, Acadia National Park and The Naturalist's Notebook. This egret landed near a pair of great blue herons; all dined peacefully together from the waters on MDI's northern side.