Avis
8.4
You pay a few dollars more per day and get newer cars, shorter counter waits, and the most reliable one-way inventory of the big three.
Typically $52 to $95 per day at major airports before taxes and fees.

A weekend city with a road-trip radius
Nashville rewards a two or three night trip: downtown is compact, and the best of the region sits within a 90 minute drive.
There is no meaningful rail service here, so the real decision is fly-and-rent versus drive from wherever you are.
Flights
BNA is 15 minutes from downtown with strong low-cost carrier coverage.
Driving
Within a day's drive of Atlanta, St. Louis, Chicago, and Charlotte.
Rental Car
Recommended if you plan any day trips out of the city.

Better curated than the Broadway strip suggests.

Quiet, shaded, and 20 minutes from downtown.

Book the moment the calendar opens; this is the real Nashville show.

444 miles of no-billboard, no-truck parkway starting south of Nashville.
Two full days covers the essentials and three lets you add a day trip or an outdoor morning without rushing.
Check the getting-around notes above first: in some cities transit and walking beat a rental car outright, and in others a car is the only practical option.
The tools and providers that fit the way this trip actually works.
8.4
You pay a few dollars more per day and get newer cars, shorter counter waits, and the most reliable one-way inventory of the big three.
Typically $52 to $95 per day at major airports before taxes and fees.
8.7
The most complete trail database in the US, and the reviews are recent enough to tell you whether a trail is muddy, closed, or busy this week.
Free tier is usable; the paid plan runs about $36 per year.
Best used as a price check and a way to filter for genuinely refundable rates rather than as your only lodging search.
Varies by market; always compare against the hotel's direct rate.