over 3 week traveling in Japan

Hello,

We are planning to visit Japan, our trip will be more or les 24 days in family of four, where only one child is <11
25/07 - 31/07 between Osaka, Hiroshima, Nara e Kyoto
31/07-8/08 Kanazawa and thru Kiso Valley combine with a car rental (probably)
08/08-12/08 Tokyo
12/08 - 18/08 Hokkaido (Biei, Furano area and Sapporo).

We were thinking thinking to by regional passes? is it a good choice?

thank you!

Marta