JR pass is it worth it for me or should i take only the Suica card?

Hi, I'm going to travel to Japan for the first time from February 2 to March 1, so more than 21 days.

In detail, this is my travel route:

From 2 to 10: Arrive at Narita Airport, then Tokyo, and go around the city.

From 10 to 17: Kyoto, and from here I'm gonna take a day (the 16th) to go to Ine.

From 17 to 24: Osaka, and from here, again, I'm taking a day (the 23rd) to go to Ogijima Island, Kagawa.

From 24 to 1: Kamakura, and on March 1 back to Narita Airport

I was thinking if I really need the JR pass. Can someone help? Also if I have to take only the Suica does the card work on the whole of Japan? or does it at least include my destinations?

Thanks,
Cheers