Boston By Aida  Having retired and moved to downtown Boston I am getting to know the neighborhoods of this city, arguably the best city for walking in the USA: from the 'Garden' where the Celtics play, to Fenway Park home of the Red Sox; or from the North End and Boston Harbor through Quincy Market and Faneuil Hall to Beacon Hill and Back Bay. Follow the Freedom Trail for History, and stop at the pubs and restaurants for refreshments. Stroll the Esplanade beside the tranquil Charles River, where the Hatch Shell has outdoor concerts in the summer. With the digital camera that our sons gave us I am seeing Boston from different points of view.