Tokyo - Aichi - Kawaguchiko - Tokyo

Hi!
Been researching on the cheapest yet efficient to get to Ghibli Park in Aichi from Tokyo. I also thought it will be more efficient if we come from Aichi to Mt. Fuji before heading back to Tokyo.
I'm traveling with 2 kids and open to the thought of getting a hotel overnight in Aichi thinking it give us more time at Ghibli Park and save the time from traveling a similar path from Tokyo to Kawaguchiko. Or am I wrong to assume this?

What JRP Pass is recommended for this route? These two destinations are the only ones we'll visit outside of Tokyo.

Thank you in advance!