You can't mention Nashville without talking about the Grand Ole Opry. Get tickets to see a show or take a tour of the Opry and get your chance to stand in the iconic wooden circle.
Gaylord Opryland Hotel has many shops and restaurants. Walk around the stunning hotel for free. Maybe take a gondola ride! If you stay here, the hotel has a waterpark for guests only who book the SoundWaves Experience.
Hit up the many bars and music venues along downtown Broadway. Those under 21 allowed in most bars/venues until 6 p.m.
If you want a classic country bar off the Broadway path, this is the place. There is a good chance at least one of the musicians on stage has played with a country legend.