Best itinerary

Hi,

Large family (6A 5c) travelling March 31 - April 15. Just wondering if it is better to get the rail pass - if so which one? or get separate tickets please??

Proposed itinerary is
* Narita - Osaka via Nagano snow monkeys. day trios from Osaka to Kyoto, Nara, Hijemi return to Tokyo via Mt Fuji.

Or is it better to do Mt Fuji as a day trip from Tokyo? Will there be somewhere at the station we can leave our luggage??

Thank you so much for your help, I was thinking the Golden arch pass but then this wouldn't cover Mt Fuji on the way back but perhaps it's better to do as a day trip??