If you are keen to get out and about in the area, why don't you head to the Covas Beach?.
Visiting just one town or city, regardless of its popularity, can only ever give you a limited view into the wider qualities of a region. So try to allow a few days to discover Galicia's other attractions. Cerdido, 20 miles (32 kilometers) to the east, and Barreiros, 20 miles (32 kilometers) to the northwest of Viveiro are good places to visit if you're keen on learning more about this region.
About 45 miles (72 kilometers) to the south of Viveiro is Lugo, a regional center where you'll find Lugo Cathedral, Parque Rosalia de Castro and Praza Maior. Lugo City Walls and Museo Provincial are some other interesting attractions worth checking out for those who have more time on their hands.
If you're keen on soaking up some of the the local culture, head to Galicia's history museums, art museums and art galleries. Faith is a illuminating facet of every region's make-up, so why not spend a little time in Galicia's churches and other important religious sites.
Why not make use of passionate locals keen to share their backyard with you and join a special interest tour? Winery tours, cycling tours and segway tours are popular here. When you hear the call of the wild, do as the locals do and spend a few hours hiking and mountain climbing.
When it comes time to head off and say "Adiós" to Viveiro, you'll have heaps of happy memories to keep forever.