Sassnitz is a city in Mecklenburg-Western Pomerania.
Trains from Bergen (Rügen), Binz and Stralsund. A change may be necessary at Bergen or Leitzow if arriving on a long distance train. The train station and bus station are next to each other, and only a short walk to the town. There is a bus link to/from the Ferry Port (for Sweden). If using the regular Sassnitz - Binz bus service for the ferry, the nearest stop is in Dubnitz (after the turning to the port at the top of the hill, if traveling from the Binz direction). It will seem quite a long way from this stop to the terminal if you are backpacking!
Frequent buses to Binz and other Rügen towns. Beware that, on rural services, changing from one bus to another seems to be popular — the driver will announce "umsteigen (placename)".
The old part of the town behind the northeastern end of the harbor. The town is is on cliffs above the harbor, there are steps down near the shops, or it can be approached through the old town. Walk past the shops (the sea should be on your right) and fork right downhill.
Ferries to Sweden used to leave from the harbor here, but now use the modern port near Dubnitz known as "Fahrhafen Sassnitz"
Visit the U-boot museum. This is near the disused ferry terminal. Perhaps surprisingly, the U-boat (submarine) on display is a former British submarine, H.M.S. Otus of the "Oberon" class, which was towed to Sassnitz after having been saved from a scrapyard in Portsmouth (GB).
There is a supermarket along past the shops, turn to the left if you've come down through the pedestrian street from the train/bus stations.