Thanks to an earlier posting on this website, we discovered bilbaogreeters.com, an organisation that provides, free of charge, an English-speaking guide to Bilbao. The Guggenheim may be the initial draw for tourists, but there is much more to this fascinating city.
My top tip? Meet up with a guide as early as possible in your stay. Ours told us: where to eat outstanding seafood; how best to use the excellent public transport system;and what is worth seeing, apart from the "Guggy".