Late here, but I wanted to add to what London had to say.
Yes, there is a lot to do in Nashville. Thing is, the more interesting stuff would require quite a bit of walking. I doubt if Amber would be up to the strolls required to visit any of the historic sites. (Belle Meade, Travellers Rest, The Hermitage, Scarritt Bennett Center) Even if they did the club thing (Wild Horse Saloon, BB King's HoB, etc. ) on Second and/or Third Ave or took a walk down Broad, you're talking at least a mile or two, some of it on inclines that might be too much for Amber.
Worst case scenario, the The Famileh Geh visits Centennial Park and Ms Reid gets shrieky over the boho types minding their own business walking with the snakes and sugar gliders or whatever else people with more money than sense buy instead of adopting a cat or dog or a perfectly functional bottom. (J/k, I'm a vanilla white woman aka the source of all evil in the U.S.)
There's a tradition here where lesbian couples declare their love by slow dancing in front of the LeQuire "Pallas Athene" statute. We're used to it, most of us say, "Awww!" and move on. The response to Eric and Ricky would something along the lines of, "That butch couple is sweet." Becky and Amber might draw a different kind of attention, though.