How about fishing?
Wendy's headquarters is only half a mile up the hill from the river.
(Makes you wonder where they get that "fresh" fish, daily?)

Eeeuwww! Back when I was in Columbus, ('76-'80) if you fell in the
Olentangy, they took you right to the student health center, to give you
shots for typhoid, dysentery, and who knows what else!
Is it any cleaner, now?

Yes. The exception is when we get heavy rain. Dublin's sewers overflow and
spew into the river.

Nope! That was fixed eight years ago when they built the tunnel. Robot
drilling machines, 8 ft diameter, dug a 12 mile tunnel through mostly
solid rock, 80 ft underground to handle the sewage to the treatment
center.