You may go around of the island in 2 or 3 hours.
Main industry of the island is the fishery, they used to keep cats with great care for long time.
I will wait for you at JR Ishinomaki station, then we go to Tashirojima Island by boat of duration 40 minutes.
You may NOT feed cats, but do not forget cat teaser to play with them.
Boat tickets and guide in English or Italian included.