Ishigaki for the next 3 days, car rental?

Hello!

My fiancé and I are coming to Ishigaki for the next 3 days, after that we are headed to taketomi.
Checking this sub, we found that is advisable to rent a car (our hotel is close to the port, where cars can be rented).

Considering the next days the weather forecast tends to be rainy, would you still recommend renting a car for our stay?

Also, if someone wants to give us recommendations for rainy days in ishigaki, feel free to share.

Thanks a lot in advance!