If you do not have car, joining a day tour is a good alternative to see Okinawa. I have joined Jumbo Tours Course A Tour (Nago Pineapple Park, Kouri Island, Churaumi Aquarium, Cape Manza, etc.). Price was ¥6000, entrance tickets and an audio guide were all included. There were ample time at each location for sightseeing, photo-taking and at the Churaumi, for having lunch and seeing the dolphin show. Itinerary is clearly written on their website. Booking was simple and easy. The lady tour guide accompanied on the trip was funny and helpful and definitely made the whole trip a lot more enjoyable.