It's a quick 3 stops for Victoria to the leafy suburb of Dulwich, where London's first public picture gallery opened long ago. Until next month you can take in a fabulous exhibit of watercolours by John Singer Sargent. "Delicious," in the words of the co-curator, Richard Ormond, who is the great nephew of Sargent and an art historian in his own right. Have lunch at Rocca before or afterwards. The village atmosphere of Dulwich will remind you of Chatham, Cape Cod.