When vacationing in Florida can we pay a guest fee to swim in the indoor pool at the Long Center in Clearwater FL?

Yes, there is a nominal fee for all non-members. Worth the fee.

Yup.

Yes

Yes you can! Even though they host events and competition the center is open for public swim as well a very small fee and the amenities are worth every bit of it

Yes. It's a small fee and worth every penny.