You will no doubt enjoy all that the Rick Steves' London Tour has to offer and you can't go wrong with any of the options available to you for your free time.  London has some of the best museums and art galleries in the world.  There are fascinating theater productions and first class concert venues.  Lovely parks abound for strolling or relaxing and there is no shortage of world class shopping.  Check with you Rick Steves' guide for the best places to get discount theater tickets and for insider information on when to catch the horse guards or palace guards changing watch.  See what festivals are going on while you are there or just relax at a beautiful hotel for afternoon tea or have a pint at the pub.  Whatever you choose, it will be a week to remember.