It sounds like a lovely place. I probably would go for an easy stroll there, but limit the time to 30-60 min and the number of days/week. You won’t be near the surface and limiting time would also reduce exposure.
Wearing a mask and glasses would further reduce it.

I guess I’m always looking for a middle ground between risks and benefits. Seeing ducklings would be a big mental benefit for me.

Like @pacathy, I would wear a mask and go. I still visit the resacas (backwaters) in our local birding parks, we just try to choose a calm day, and rather than having our snack in the bird blind we hike to the picnic area. I also feed the backyard birds, wearing gloves and mask while cleaning and filling feeders and birdbath.