Tour Saint Andrew’s Dune Church, Southampton’s most picturesque landmark, with informed parishioner Cindy Willis. Originally built as a lifesaving station, it’s beautiful rustic interior was created by a local carpenter, then filled with treasures, not the least of which are its Tiffany windows. After the tour, follow Gary Lawrance, architect and co-author of “Houses of the Hamptons, 1880-1930”, on a stroll though the neighborhood of elegant mansions and two of summer society’s most popular clubs.