How to get back from Churaumi Aquarium

Dear Sir or Madam,

I have booked my hotel for one night in Naha in the Kokusai St. area.
I will be arriving at Naha airport from Korea by noon so I planned to go straightaway to the aquarium taking the Yanbaru Express Bus.

I think I will finish visiting the aquarium by 7PM. I have checked the timetables for Yanbaru bus but the last departure seems to be before 6. What are the alternative ways to go back from Churaumi Aquarium to Kokusai St?

Thanks in advance.

to take the regular bus back to Naha, you need to take the #65 or #66 to Nago bus center
http://oki-park.jp.e.ms.hp.transer.com/kaiyohaku/acc/147

from Nago, the last #20 bus to Naha leaves at 8pm arriving at the Naha bus center at 10:20pm. If you miss the last bus you're looking at a very expensive cab ride to Naha.