As National Parks Week approaches, a guidebook author joins us to share ideas for exploring America’s 59 national parks. Then tour guides to France help listeners plan their summer voyages, with advice for marking the 75^th anniversary of D-Day in Normandy, and enjoying a "babymoon" in Paris. Plus, the author of "Sea People" tells the fascinating story of how Polynesians came to populate the most far-flung islands on earth.