Okinawa - Churaumi Aquarium

I just read on some other forum that somebody spent about $70 to travel by bus from Naha to Churaumi Aquarium. Please tell me that this is not normal. I intend to visit while I'm in Okinawa,but is it really worth it to spend that on the commute alone? I don't drive.

It is more around $50 and explained on the following page:
http://www.kaiyouhaku.com/en/access.html

Direction to the Aquarium is explained here :
http://www.kaiyouhaku.com/en/access.html

Thanks for the info. Sort of put a little damper on things.

It seems the bus ride from Naha to Nago is 3 hours...has anyone been on the bus ride? That's pretty long without a bathroom break...should we get off somewhere for bathroom break, then get on another bus? Please advise how anyone can stay on bus for 3 hours without break? Is there a restroom when we get to Nago to transfer to bus to Expo Park? We are in our 60's, renting car is not an option.