Darmstadt is located between Frankfurt (30 minutes by train) and Heidelberg (1 hour by train). All listed locations are easy to reach via public transportation.
Heidelberg is a favorite destination for tourists from all over the world. The city offers a charming city center and the famous Heidelberg castle. Easy to reach via train from Darmstadt main station. http://www.heidelberg.de/english
One of the largest financial centers in Europe but also a city with its own, very unique character - international and regional at the same time. Explore food from restaurants from all over the world and enjoy some typical apple cider, all at once. Easy to reach via train from Darmstadt main station. https://www.frankfurt.de/sixcms/detail.php?id=stadtfrankfurt_eval01.c.317693.en
A famous theme-route running through the Odenwald forest very close to Darmstadt, between the states Hessen and Baden-Württemberg. Easy to reach via public transportation. Discover mountains, wine, castles and more through bike & hike http://www.diebergstrasse.de/