Taking a stroll down the avenue is such a national institution that there's even a colloquial expression for gin-bura.
It is best to take a stroll down the avenue at around 5 in the evening. 
mnli hypothesis: It is best to take a stroll down the avenue at around 5 in the evening.  premise: Taking a stroll down the avenue is such a national institution that there's even a colloquial expression for gin-bura.