Okinawa beaches with rentable sunbeds and umbrellas?

Okinawa beaches with rentable sunbeds and umbrellas?

Hi everyone,
I’ll be visiting Okinawa (main island) in summer and I’m trying to plan some relaxed beach days.

Which beaches actually have sunbeds and umbrellas set up that you can rent on site (not just hotel guests)?

I’m especially interested in beaches around Onna and near of it, but I’m open to other suggestions as well.

Do these rentals need to be booked in advance, or is it usually first come, first served during the season?

Thanks in advance!