My tip“Book ahead in summer; the short tour takes an hour, and the long one as far as the Puente Bizkaia takes about two hours.”
A boat trip on the Nervión estuary (the ría) shows how Bilbao changed from an industrial city and shipyards into a capital of contemporary architecture: the Guggenheim Museum and the Zubizuri Bridge, reaching — on the long tour — the suspended “Bizkaia” bridge, listed as a World Heritage Site.
Address
Plaza Pío Baroja, 48001 Bilbao