Originally Posted by
rstlsgirl
Definitely go into the aldstadt ("old city") in Frankfurt. It's small, but beautiful. The rest of downtown Frankfurt is so ugly it will take your breath away, but if you have some time you could get out of FRA and go out into the Rhone Valley.
Enjoy your trip!
That's a bit harsh I think, but there aren't a huge amount of touristy things to do around Frankfurt.
The Rhone valley would be quite a trek from Frankfurt - a few hundred kilometers southwest. I think you mean the Rhine valley (Rhein in German). The city is on the Main river, which flows into the Rhine, and there are some beautiful vineyards around there.