If your trip to Okawa is all booked but your travel itinerary is a bit on the empty side, let us give you a helping hand.Plan a stop at Miejitsu Navy World Heritage Site. It's one attraction you'll find on travelers' to-do lists. If you still have some room on your itinerary, Chikugo River Lift Bridge and Koga Masao Memorial Hall will keep you entertained as well.