I need help finding a waterfront spot to have a simple intimate wedding ceremony that is wheelchair accessible and not far from parking as my dad can't breathe well in the humid Summer air.

I've seen treasure island beach does that. And it's a nice spot.

Most larger hotels have facilities to accommodate your request

St. Pete Beach community center. Have concrete access to inland waterway. Lots of parking . 1 mile from beach MAX. Several wedding held there.

All resorts on the beach their have great parking and wheelchair accessible.

Sunset or Crystal Beach would be my suggestion. Both have good parking or at least the ability to have those in need be dropped very close Alternatively, contact Marker8 Incredible sunset location