The Harz is a very popular region for trips and days out. Moreover, thanks to its central location, trips to other German regions, cities and sights are easy to organise.
Whatever your travel plans look like - be it a mountain tour to the Brocken, a visit to the UNESCO World Heritage City Quedlinburg, a shopping tour to Hannover, a city trip to Berlin, ... - the following links should help you find a suitable means of transport.
By train: Deutsche Bahn or Harzer Schmalspurbahn (narrow-gauge railway)
By bus: city bus or intercity bus