Getting from Bremerhaven to Bergen-Belsen

I am traveling on a cruise which stops in Bremerhaven in June and would like to take a tour of Bergen-Belsen. This is not offered by my cruise line. How is the best way to get to Bergen-Belsen from the Bremerhaven port. It looks like it is about 80 miles.

I am not sure if you had already found this link. I see they do have a contact email address there as well. Maybe they could help you to find the best alternative.

http://bergen-belsen.stiftung-ng.de/en/visitor-information/directions.html