Do I need a JR pass?

I wonder if I should buy a JR pass and if so, for what period of time?
My wife and I are going to Japan from april 23rd to may 10th.

Here is our itineray
April 23rd to 28th : Tokyo (No day trip)
April 28 to april 30th : Kawaguchiko
April 30th to may 2nd : Matsumoto (Day trip to Kamikochi)
May 2nd to 4th : Kyoto (No day trip)
May 4th to 5th : Naoshima
May 5th to 7th : Onomichi and bike ride to Imabari
Math 7th to 10th : Osaka (Day trip to Nara)

Thank you