Be sure to book in advance: for example, to get the overnight ferry that departs at 10pm (or 11pm in the Summer months), you must book by 5pm. There are two boats, a big slow ferry, and a small fast speedcruiser. Travel time is 2.5 hours on the fast boat and 9-10 hours (overnight) on the slow one. The price of the ferry ranges from around 10,000 yen to 15,000 (The price is raised in the Summer months).
Taking the overnight ferry can be an interesting way to travel if you don't suffer from sea sickness. Each passenger is allocated a reclining seat in a room resembling an aeroplane cabin. On board there is a basic restaurant and many vending machines selling food, soft and alcoholic drinks. The facilities are basic. You can rent blankets for 100yen.
After leaving Tokyo Bay and passing under the famous Rainbow Bridge the coast line of the bay becomes hard to see but soon after sunrise it's possible to relax on the deck and watch the ferry approach and dock in three islands - Oshima, Toshima and Niijima - before reaching Shikinejima.
If you have booked a room in a "Minshuku" (Japanese style B&B) then the Minshuku's staff will almost certainly be waiting at the port to greet you and drive you to your lodging when you arrive at Shikinejima's port at around 8.30 am.
Lounge. The beaches are incredibly quiet, as so few people are on this island. Tomari Beach is very popular with tourists in the summer months - here the water is clear and snorkeling is possible.
As the island is so small, there are but a few restaurants, and they all close by 10 PM.