I'd first ask the couple if there was a place that they go to
regularly that is really special to them. That way, you not only
documenting their love for one another but "their" place also. That's
two factors that will evoke emotion in your clients. If they like
going to the ball park, go for it. If they like hiking, go for it.
If that doesn't work, I'd then ask them what type of "feel" they'd
like for their photos. Some like the urban feel with lots of brick
around and some like the country feel with lots of trees. There are
plenty of places around Chattanooga that provide both.