Private tours
Your own guide, your own pace, priced per group rather than per person on most listings.
Prices run from €48 to €795, and half of the 22 priced listings cost €211 or less. Most take 2 hours to 6 hours. The best reviewed with at least 100 reviews is Heidelberg: Torchlight Tour with a Night Watchman (4.7 from 125 reviews).
For the operators we researched and recommend, see our food tours and cooking classes in Frankfurt, or the experiences overview.