Yes, summertime (July-August), this place' herring museum is open so you can discover the importance of this little fish to the Swedish nation :))) You will also see some fishing gear and such of course. Should you want to see it at another time, you will have to call the number below and ask if it is possible.
This place is famous throughout the west coast and gets into more of a full swing 30 April every year to serve great herring dishes (many combinations of their specialities) but also other things for those of you not into this very special fish. It has great archipelago views so you can probably sit here on a sunny evening and just enjoy life (we were here in the rain and just before opening time but we know of people who enjoyed it). Expect fairly steep prices but this is one of those where it's worth it. Click on the second link below to read about it in English.
The easiest way to get here is definately by car (or making a bike trip around the main Tjorn island) but there is the odd bus here too from Tjorn (around five connections a day). These buses aren't that frequent so look them up in the timetable below. If you come all the way from Gothenburg which is perfectly possible, most journeys include a change in Stenungsund to bus 350 but you might also have to change at Kållekärr. In any case, you want the bus bound for Rönnäng, the "capital" of Tjorn.
Everywhere you look on this island, there are herring companies selling their fish to main food producers and restaurants all over Sweden but of course they would sell to you too if you could get it home. Even the piles of herring barrels lined up in the harbours seem more here than in other fishing villages.
Favorite thing: Go for a walk on this small islet and just look at houses. Most are gorgeous and you'd want to move in just about anywhere if you knew it was less remote and not blowing a gale in winter. Don't be afraid of exploring the small alleys here and there too (see second picture). This is a small place where every space is needed and the houses huddle together which also helps protect everyone from the wind.