My favorite experience in Japan so far and I've traveled extensively throughout Japan.
I am glad there are still a few places in Japan not full of tourists, especially those from Xiaohongshu. As a result of it therefore being quiet, Ikeshima's scenery, cats, people, and the overall atmosphere, left a deep impression on me.
As others noted, it's a great place for people interested in Japanese post-WW2 history and exploring ruins in a non-kitschy way. There is a tour offered by a former Ikeshima miner who is still a resident; the tour is only in Japanese and you're able to explore parts of the island that are otherwise off-limits to visitors.
There are many, many cats on the island. Please, if you come here, have a heart and bring a bag of dry cat food with you. The cats were quite hungry - I know because I fed almost every cat I encountered.
I feel very fortunate to have been able to visit Ikeshima because who knows if the Japanese government will continue the already limited ferry service once the remaining residents pass away.
While I explored the island and encountered the residents, I wondered what they felt and thought living in a place that's somewhat in ruins and is a shell of what it used to be.
The place is beautiful in its own way and I wish there were oral history testimonies collected from the remaining residents and those who have left Ikeshima. It's a time capsule of sorts and was a wonderful experience. I'm thankful above all.
Amazing. #1 tourist spot in Japan. Better than Kyoto.
There pay parking lot is across the street and a little north of the ferry terminal. You don't need to park in that lot. Plenty of free street parking across the street from the pay parking lot. Park near the water. Just find a spot out of the way. Should be fine.
There is one small shop that sells snacks and stuff, near the ferry terminal, but don't count on it. Have food and water ready, before you go to the island.
You want to catch the 7am or 9am ferry.
The tickets are sold in the ferry terminal, but they don't announce when the ferry has arrived. You need to pay attention. You want to get the 2:17pm ferry back to seto port.
There is no food or anything on the island. If it's summer, there are a million wasps and HUGE spiders in the old buildings. Some buildings have people living in them, so don't be too crazy.
Don't miss the ferry back. They don't announce when it's arrived. Tickets are 450 yen each way.
There are many islands and towns that once prospered from coal mining and other industries, but there is probably no other place in Japan where you can freely explore the facilities from that era. Considering the possibility that the ruins may become inaccessible due to deterioration, or that the sea routes may be lost due to the decline in the island's population, this is a precious island that you should visit while you still can.