Daytime activities and coffee

Looking for ideas for daytime activities in Okinawa near Naha. Last time I was there for work was a couple months ago and I visited Naminoue Shrine and did a little hiking around there.
On the bucket list is Shuri Castle and Okinawa World.

I usually have about 5-6 hours to get out and go places before I need to be back for sleep by about 6pm. Would love recommendations on good places to visit within that timeframe. and also good food place ideas.
I have been craving Sukiyaki, Unagi-Don and some good Bluefin Toro bad.

I also had a hard time finding whole bean or ground espresso in Don Quijote and spent more time than I care to admit holding bags of coffee up to my phone to translate 😆
I usually drink DeathWish or Cafe Bustelo in a pinch so any recommendations on a source of good espresso beans or ground would be very helpful.

Thanks!