U-boot museum
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.
craft centre
There is an extensive craft centre near the bus terminus in Putgarten. It is about 2 km walk to the Kap, where there is a lighthouse museum.
Take a bus to Kap Arkona. A change of bus may be necessary in Altenkirken, although the driver may confuse passengers by simply changing the number of the bus they are on.