Very wise choice. If you do head in to London on your last day with a little free time on your hands, also check on what's showing at the Victoria & Albert and at the Tate Gallery - they may have some interesting photography exhibits on display. It's been ages since I was last in London, but a few blocks out Old Brompton Road from Harrods (stand on Old Brompton, facing Harrods front door, turn right, walk about four or five blocks, turn left down the side street) there's a wonderfully fun restaurant called Borscht n' Tears. Russian food, cramped space, live music, very energetic. You may well not have time for it, but if you do, I recommend it.