How to get around easily in Ishigaki

Hello, I will be joining a cruise which will disembark in Ishigaki. We have been warned that it is very difficult to get around the area as it is very small so transportation is said to be limited. However the ishigaki excursion was too expensive and my family and I decided to DIY our day in Ishigaki. We want to go from the port to Don Quijote Mall. Are there any ride hailing services like Uber or Grab that work in Ishigaki? Any advice regarding transportation would be extremely helpful! Tyia!

by newwieetastic