Whale watching tours in Okinawa

Hi, I’m thinking of booking a whale watching tour and then staying at Tokashiki island for a night. Is it easy to book a tour on the island itself or should I do it in advance? Also how much would it cost to book directly with these local tour groups?

I’m looking at online third party websites and it seems to cost around 35 USD. This includes the ferry to and fro Naha port. If it’s cheaper to book via these third party website I am thinking of taking the inclusive ferry to the island, joining the whale watching tour and then forfeiting my return ferry ticket to remain on the island for the night. Thanks in advance for anyone’s help!

by hihellohellohihi