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Urauchi-gawa Cruises. The Urauchi River, Iriomote's Amazon, is the reason many day-trippers come to the island. Boats navigate up the broad, coffee-color water through mangroves and ferns to an impressive waterfall, all for ¥1,500. Allow three hours for the round-trip journey. The first boats depart at 9 am, and the last leave at 4 pm. Kayak rentals are available if you want to go it on your own, or you can opt for a guided kayak tour. Some companies tow the kayaks upstream so you can enjoy a leisurly paddle back down.