In summer the White Island glows red hot. Up to five million revellers – from well-heeled hippies to hip young clubbers – jet in for blistering discos and sublime sands. The word on the sunset beach of San Antonio is quite simple: Ibiza rocks. But the third-largest Balearic Island has a more subtle side. Arrive off-season or head to the hills for gourmet cuisine, nature walks and mountain bike tours. Ibiza Old Town, known as the Dalt Vila, packs 2,500 years of history and culture into one UNESCO World Heritage Site.