Union Oyster House, 41 Union Street, (617) 227-2750, www.unionoysterhouse.com, is around the corner from Faneuil Hall. Yes, it’s old (open 1826, it bills itself as the oldest continuously operating restaurant in the nation), and very touristy. But kids can visit the Freedom Trail room to spot the carvings and displays of the main stops on the trail and chow down on a fish filet sandwich ($7.95) or hot dog ($4.95), while adults enjoy a bowl of creamy clam chowder ($5.50).