Itinerary Help: 1 Day on Okinawa Main Island

Hi everyone! My partner and I are planning a short stop on Okinawa’s main island in May and would love some advice.

Logistics:
– Arrive Thursday around 10pm
– Leave early Saturday morning (heading to Ishigaki for 5 days)
– We’ll have one full day (Friday) on the main island
– Open to renting a car
– Currently considering staying in Naha for airport convenience, but flexible if another area makes more sense

Our goal is to get a good feel for Okinawa and experience things that are unique to the main island. We’re not focused on beaches or snorkeling, since we’ll be doing plenty of that in Ishigaki.

So, my question is:
If you had just one full day on Okinawa’s main island, what activities or attractions would you recommend? Any advice on where to stay or whether a car is worth it for 1 day would also be appreciated.

Thanks in advance!