I've never understood why so many people find it necessary to say "go stay at a campground" in a Walmart thread....
When we are between destinations, Walmart is perfect. So are Cracker Barrel, a rest area or a truck stop.
We've run our generator, but as mentioned by others, will usually park away from others if we plan to use it, or find someone already running theirs.
When the humidity isn't so bad, a couple of 12V operated fans tend to work just as well for us, and the ambient noise from those tends to block out other people's generators or reefers.