No. Both islands are connected to the mainland by bridges and have railway lines: Rügen via the Rügen Bridge and causeway at Stralsund, Usedom via the bridges at Wolgast and Zecherin. Ferries are only needed for excursions, for example from Stralsund to Hiddensee.
It is possible but long: Stralsund is about three hours from Berlin by train, and the sights on Rügen are spread out. One or two nights in Binz, Sellin or Stralsund work much better.
Rügen has more variety, with chalk cliffs, Cape Arkona, several resorts and a steam railway. Usedom is smaller, with long beach promenades between its Imperial Spas and the Peenemünde museum. If you only have one day, choose Rügen.
Entry to the national park is free. The visitor centre with skywalk, exhibition and cinema costs €14 for adults, €8 for children aged 6–14 and €30 for families; under-6s go free (October 2026). Timed online tickets guarantee entry.
Yes. The beach at Binz shelves gently, the skywalk is step-free, children enjoy the diving gondola at Sellin, the tower at Granitz (free for under-18s) and the road train at Cape Arkona, and the Ozeaneum in Stralsund has its own children's area.
Audio guides are available in English and several other languages for €3, and guided tours in English can be booked in advance. The museum is not fully step-free, but staff can help you reach all exhibition areas.