If your a lazy so and so but also love exploring cities then Segway Tours are the perfect soltion - you also get to play around on this really cool form of transport for the day.
The company behind the original Segway Tours offer tours in seven cities around the world including Paris, Chicargo and Budapest. However, such tours are now more of less available in most of the World's major cities from loads of different operators such as Scenic Segways & the brilliantly titled Human on a Stick.
If you not familiar with Segway's - the brainchild of Dean Kamen - then they could be described as an electric bicycle. Imagining a one-person Roman chariot but without the horses would get you pretty close to picturing the real thing.