If by “a few” you mean more than 5 then maybe. Free WiFi in all convenience stores, most train stations (almost all in bigger cities Tokyo, around half in bumfu

If by “a few” you mean more than 5 then maybe. Free WiFi in all convenience stores, most train stations (almost all in bigger cities Tokyo, around half in bumfuck countryside where I live), many major public spots and department stores, expressway buses, and many cafes and restaurants all have free WiFi. I was without a SIM card for several months recently and rarely had to go far finding connectivity.