Museums aren't all cobweb-covered cabinets and drab displays. Head to Vikarvet and be educated and entertained. Every piece has a story waiting for you to discover.
You'll have no end of sightseeing choices when staying in Lysekil. Vikarvet is a good place to start here, but there are many other worthy sights to consider. Fiskebäckskil Ferry Terminal, Havets Hus, and Pinnevik Bathe are near the museum and will round out your day nicely.