Here are some of The Guardian’s suggestions for the best adventure travel challenges for 2018:

  • Mongolian cycling adventure
  • Swimming the Greek Cyclades
  • Hiking weekend, Bulgaria
  • Azores Trail Run
  • Vätternrundan Bike Race, Sweden
  • SUP tour, Cuba
  • Cycling in Umbria, Italy
  • Great Wall of China trek

Check the article for the other suggestions.