Travel and Rail Pass

We are travelling to Japan from New Zealand on May 1st 2015. At the moment I am trying to create an itinerary for our 15 day visit.

We will spend the first 6 days in Tokyo. We will leave Tokyo on 7 May and I am thinking of the following itinerary travelling by train and I am wondering if it will be better to get a 7 day rail pass.

Tokyo to Kanazawa - 3 nights

Kanazawa to Nagano - 2 nights

Nagano to Matsumoto - 2 nights

Matsumoto to Odawara where we will spend 2 nights exploring Hakone before leaving for Narita to fly back home.

A seven day pass would start on leaving Tokyo and expire in Odawara.

Can a rail pass be used on any other transport within the places that we will spend time in and would it be better to get a 7 day rail pass or single tickets.