Description
A bus will depart at 14:00 to Darmstadt Train Station (from where one can also get the Airliner bus to Frankfurt airport) and then Heidelberg for a visit. Please note that the bus will not be back to Darmstadt, but that the city is on the way to Frankfurt and there is a regular direct train to the airport.
Note that there is no organized visit to the city. Recommended places can be found here: https://www.planetware.com/tourist-attractions-/heidelberg-d-bw-hei.htm