Should I get a 7 day or 14 day pass?

Hello everyone!

I need help with my transportation throughout Japan. My family (3 adults and 2 kids) have the following itinerary right now:

Day 1-3: Tokyo
Day 4-5: Kanazawa
Day 6: Miyajima
Day 7-10: Kyoto
Day 11: Hakone
Day 12: Tokyo

If I activate 7 day JR pass the day we leave for Kanazawa it'll run out before we leave Kyoto.
1) Does it make sense to buy a 14 day pass or just a one way ticket from kyoto-hakone and hakone-tokyo?
2) I understand that I can use the pass to get around within Tokyo...wondering if it'll justify cost to buy 14 day?

So grateful for this forum...the transportation is overwhelming to me!

Thank you,
Alice