You'll find ancient and beautiful churches in Vigo's Old Town. These include Santa Maria de Castrelos, which dates from the 13th century, and the 16th century La Colegiata de la Santa Maria la Mayor -- famed for its lovely Renaissance facade -- which is sometimes used as a venue for daytime concerts.
Stroll along Calle de la Pescaderia, site of Mercado de Berbes, the city's main fish market, which is famous throughout Europe. There, you'll find iced slabs of granite laden with freshly caught turbot, monkfish, spider crabs, octopus and other goodies from the sea. And though the smell is heady, it's actually the aroma of ocean rather than fish -- so you know the goods are super fresh. The fishmongers are mainly female, because the men are out fishing.
If art is more your thing, stop into the Museo de Arte Contemporaneo de Vigo, which is housed in a former courthouse (complete with gaol) within walking distance of the port. It features multimedia work by Spain's hottest artistic talents. The museum also has a decent cafe and is fun if you're traveling with youngsters. (Principe 54; +34 986 113 900; open 8 a.m. to 8 p.m. Tuesday to Saturday, closed Mondays)
Talk with the animals at Vigo Zoo on Madroa Hill. Founded in 1970 and set in lovely countryside, the zoo is home to 400 animals of 1,250 different species; current inhabitants include bears, lions, llamas and wallabies. The zoo also has a cafe, craft shop and fine views across the Vigo estuary. (At Plaza de los Leones, Madroa-Teis, Vigo, 36316 -- about a 15-minute cab ride from the port; +34 986 26 77 83/84; summer hours 10 a.m. to 8:30 p.m. April 1 to September 30, 11 a.m. to 5 p.m. in February, March and October)
Make a pilgrimage to world famous Santiago de Compostela -- medieval Christendom's third most important shrine after Jerusalem and Rome -- which lies nearly 60 miles north of Vigo and should cost roughly 40 euros per person for a roundtrip group cab ride (check rates at the tourist office). Ship tours also go there (see Shore Excursions, below).
Explore the delightful medieval fishing village of Bayona La Real. News of Columbus' discovery of the New World was first heard there in 1493, and the quaint town is also famous for its 12th century church and 16th century castle (now a state-run hotel, known as a Parador). It has a lovely Old Quarter with some good tapas bars and is 12 miles from Vigo.
Play nine-hole golf, enjoy medicinal spring waters, stroll through dense forests or wallow on golden beaches at La Toja, a gorgeous island resort about 40 miles north of Vigo famed for its thermal springs and sea-mineral based spa treatments.
Take a ferry from Vigo port to the Cies Islands, a lovely nature reserve with good beaches and a variety of wildlife (see also Shore Excursions). Boats depart at 9:15 a.m., 10:15 a.m., 11 a.m. 12:15 p.m. and 1 p.m. and start their return journey at 1 p.m., 2 p.m., 5 p.m. and 6 p.m. The trip takes 45 minutes each way. While it's possible to buy snacks on the islands, most locals take picnics.