We are not big-city fans. L.A. we can take for two days, New York maybe three. In cruising mode, we rarely spend more than a week in one location. But there is so much to do and see in London, and all so easily accessible by Tube, that it's hard to break away. Museums are for the most part free, and if you are early, not too crowded. Of course, if you want to watch the changing of the guard, see the royal jewel collection in the Tower, or check out Piccadilly Circus, there are a million other tourists you'll meet who had the same idea. You can also take in some of the many famous London theatres and shows. Better yet, how about a local folk music club in the room above a nearby pub? Musicians get up to perform across a range of styles-Scottish and English, Romanian, Hungarian, and even Mississippi Delta blues-and the audience joins in.