We walked the world’s longest suspension bridge in Portugal’s natural playground

In Arouca Geopark near Porto, my sons dared each other to tackle white-water rafting and a scary, record-breaking bridge

‘Three, two, one, and … jump!” yelled Rafael, our rafting guide. Into the air my youngest son leapt, not a moment’s hesitation, arms akimbo, legs kicking vainly against emptiness. Below him swirled the freezing, frothing waters of the Paiva River.