For context, we're all in mid-late 20s and into beer, music, and anything outdoors. Also, looking to stay at an AirBnb, so any recs on location would be great.
If there is nothing going on at the stadium where the Titans play, you can park there for free (or very cheap).
There is a nice little park area that you could spend some time at, but there is a footbridge that crosses the river from there that goes right into downtown. Save your money for something else.
You'll probably see about 10 bachelorette parties on a weekend night going on.