This was a great day trip from Osaka. We took the "Southern" Nankai train from Namba Station to Wakayama City (be sure to reserve a seat for just 500 yen more and travel in comfort). We then took a little local train to Kada. In Kada we walked a bit until we found the ferry. The island is fascinating. Pick up a pamplet in the ferry terminal with a map. We did the 3.7 km hike and saw most of the historical sites on about 2 hours. We arrived at 11:30 and travelled back on the 1:30 ferry. The tunnels in the historic battery instalations were a bit scary and made you think about the soldiers that used to be there. The flashlight app on my phone came in very handy. Be sure to bring LOTS of drinks and there is no food on the island, so snacks aren't a bad idea. If you are a war history buff this trip is a must, but be warned, the hiking is pretty strenuous.
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