A very helpful suggestion from the Rick Steves guidebook was to take a Big Bus tour. I purchased my tickets online before leaving and it worked out fine. It's really a great way of getting acclimated to a new city or place. Otherwise, you just muddle around trying to find your way, wasting valuable time. So, I made the bus tour my first real activity and it helped immensely. I did a one-day trip to Paris on my last full day of the trip, and I took the Big Bus tour there also. It provided me with the opportunity to take lots of pictures of Paris from the open-air top, which I could never have gotten just fumbling around by myself.