The most prominent of Seyðisfjörður’s timber buildings is the photogenic Blue Church. On Wednesday evenings from July to mid-August, it’s the setting for a popular series of jazz, classical- and folk-music concerts (starting at 8.30pm; tickets Ikr2000); see the website for the program. If you’re leaving on the Thursday ferry, this is a lovely way to spend your final night in Iceland.
The 1864 warehouse that once served as the regional folk museum has been moved from the outskirts of town to a prime position on the Höfn harbourfront. It's been refurbished to serve as the town's visitor centre, with good exhibits explaining the marvels of the region’s flagship national park (including flora and fauna), plus documentaries being screened. If you're interested, there are various museum-style exhibitions around town, including a rock collection and an old stockfish shed with displays on fishing and seafaring.
For insight into the town’s fishing and telecommunications history, stop by this worthwhile technical museum. It’s housed in two buildings on Hafnargata: the impressive 1894 home of Norwegian shipowner Otto Wathne (the old telegraph station), and a mechanical workshop from 1907.