I have been to Hirashima before. If I want to go, I can take the 13 bus to the old gate of No.1 Middle School. There is no need to charter a car because there are many people. Just take 13 bus. Contact the boat before you go, and be sure to go to Hirashima by boat. There will be a small pier under the old gate of No.1 Middle School, where you can usually take a boat. The village next to you can ask how to rent a boat. A few hundred dollars is not expensive. This is the best time to go to Hirashima. In addition, if you have a picnic on it, don't eat wild taro, which is poisonous.
I'm not familiar with Zhoujia Courtyard.