There are three beaches in Tokashiki Island. I recommend Aharen Beach. First, this beach has a beautiful observation deck where you can enjoy the beautiful sea view. Second, there is an uninhabited island opposite this beach. You can rent a boat to explore the uninhabited island. Third, there is a mysterious beach next to Aharen Beach. If you want a day trip, you can go to Aharen Beach in the morning and go to the mysterious beach in the afternoon. There is plenty of time.