If you drive on the Seibu Trail, it is worth visiting this lighthouse. The day we were there was a cloudy day so we couldn't see much across the sea but the view of the coast on both sides of the lighthouse was beautiful.
If you drive around Yakushima Island, don't forget to stop here.
This lighthouse is white and strong, with great views out across the coast and to neighbouring Kuchinoerabu-to Island. It would be a great place for a picnic too!