Unlike the not-so-distant past, the majority of "leaf peeping" passengers are not necessarily senior citizens, and while many bus tours include passive city and countryside sightseeing, educational and active excursions are growing in number and popularity. Close to Halifax, the dramatic lighthouse point at scenic Peggy's Cove is an inspirational favorite with artists and photographers; in St. John you can get close to the Reversing Falls Rapids in a boat; you can also try coastal kayaking amid friendly harbor seals and porpoises in Bar Harbor; follow the historic Freedom Trail in Boston; or hike the ramparts of the Citadelle overlooking Québec City -- the only walled city in North America.