If you are like me you will walk. This is for two reasons. One I like walking because it is the best exercise you can do and in a city like Paris there is plenty to see when traveling on foot. The other reason is because I am mentally lazy and for me it is easier to walk two hours to get somewhere then it is to take two minutes to learn which bus or metro to take that will get me there in ten minutes. Luckily there are plenty of people not like me that keep the buses and metro in Paris in business.