Tenerife, the biggest and best-known Canary Island, receives over 10 million visitors a year, most of whom head straight to the tourist resorts of the south. We went there when HRH the son was 10 and we had a great time. We walked to the snow-draped Pico del Teide, Spain’s tallest mountain and home to some of the most fabulous hiking in all the country. We also enjoyed some tropical-forest walks and designer-shop struts and dark forays into volcanic lava. Tenerife is a cultured and civilised island of extraordinary diversity.