IMO there are certain cities that can only be explored by foot maybe with an additional hop-on-hop-off-bus or such. But any of the old European cities or for example New York City - you cannot get to know those cities unless you put in some series walking times.
I'm not much of a shopper but in the streets of Bordeaux, all those little, individual i.e. non-chain stores are a sight to behold. What a contrast to the soulless malls here in the US.
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