Next to Hiiumaa is another island called Kassari. Kassari is the 5th largest island of Estonia but it's so close to Hiiumaa that you might even not notice driving over a small bridge and getting to another island.
It's a perfect place for nature lovers - you can hike in the forests or camp on the beaches without being much interrupted by the others.
We had a small road trip and visited following places:
Orjaku nature trail - you can walk between the reed and junipers and there is a bird watching tower where you can observe the bird life at protected Käina Bay. Kassari Museum - it is a sm…