Swing by Stenstan Visitor Center for some useful tips before you start exploring. It's an one-stop shop for tourist information.
You'll have sightseeing choices galore when visiting Sundsvall. Stenstan Visitor Center is a great place to kick off here, but there are many other worthwhile spots to consider. Birsta City, Nordichallen, and Himlabadet Water Park are near the tourist information center and will top off your day nicely.