Will there be any water? Because if there will be no water, there is no need to add swimming.
Define "water".
Good god NO! I wouldn't touch the open water in Night City. I mean, you'd have to burn your clothes afterwards and take a chemical shower just to get rid of the toxins and that's if you don't get any in your mouth. Yuck!
Burn your skin too... unless the "water" already took care of that.