Tanegashima… worth the trip or no?

As the title asks, trying to see if it’s worth my time to visit the island. I will be staying in Yakushima for a few days before that.

I see that there is an option to take a ferry from Yakushima to Tanegashima, so that is why I am asking.

I don’t have a drivers license so I can’t drive, will that be a problem?

All the websites I’ve found that mention Tanegashima seem to gloss over what’s available in terms of transportation besides walking, rental bikes (don’t say where exactly), and rental cars. From what I’ve read, Tanegashima is big enough to be bothersome to try and walk or bike exclusively.

Thank you for your help!