Frankfurt is not an especially pretty city. If you find yourself trapped here, asking, "What can I do?" the best answer is to go somewhere else. I aim to give you a list of places to visit within roughly 60-90 minutes by regional train from Frankfurt Central Station. The destination needed to have a direct or otherwise easy train connection to qualify. Likewise, it also requires an old town with enough things to do to fill at least half of a day.
This salad uses a vinegar base for the dressing, which is typical for South German recipes. The Swabian component is the use of vegetable boullion, which gives the dish a vibrant flavor.
For an easy hike across some of the nicer farmland north of Frankfurt, there is the Monastery of Ilbenstadt. The monastery complex is mostly preserved and features a remarkable late Staufen Romanesque church and a Rococo gatehouse, hinting at the centuries of prosperity enjoyed by the monks here. Behind the monastery is a nicely preserved agricultural complex from the 19th century.
The Red Moor is an ancient wetland in the highlands of the Rhön. Though much of it was drained or harvested for peat, today, it is a nice glimpse of the primeval landscapes of Europe. Including ancient deep ponds or "eyes of the moor," which served as cult sites for worship through to the end of the middle ages.
The Vogelsberg is a region in Upper Hessen known for its rolling and forested landscape. Much like the Odenwald and Westerwald, it's a mixture of small villages, forests, and agricultural land. This hike takes you up through this landscape to a highland moor, an ancient wetland with a unique natural landscape.