I recommend you visit them some day. Ruby Falls is a bit overdone - they have lights and all that to spice up the waterfall, but it's still one of those things that is just amazing to look at. Rock City is just a really nice garden with great views. There's also the Incline Railway, railroad museum, and a bunch of nice stuff in downtown Chattanooga. It's an old-school tourist trap, but the touristy stuff tends to be classy. We went there on vacation 45 years ago when I was a kid, and my wife and I still go there some since we're a couple of hours away (living in another tourist trap).