On holiday!

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Across
  1. 3. A deep valley with high, steep sides
  2. 6. Wild animals and rare plants
  3. 8. All the traditions, beliefs, customes, etc of a country
  4. 9. Fruit and vegetables
  5. 11. The weather, temperature, etc in a place
  6. 12. Swimming with a snorkel
  7. 13. Very big
  8. 14. A sport where you you ride on a sleigh (or sledge)
  9. 16. To force out of something with a lot of pressure; Synonym of explode
  10. 17. Having a view of (from your room)
  11. 18. To make a journey back to where you started from
Down
  1. 1. Too full of people or things
  2. 2. Synonym of gulf
  3. 4. Rising at a very sharp angle
  4. 5. Poisoning of water, air or land
  5. 6. A place where water falls off the edge of a steep cliff or mountain
  6. 7. Shoe-like footwear with long paddle extending from the toes which help with underater swimming
  7. 10. A large sandy area of land with high temperatures and few plants
  8. 11. Synonym of modern
  9. 12. Covered in snow
  10. 14. Beautiful, amazing and visually attractive
  11. 15. Swimming under water
  12. 18. Synonym of port
  13. 19. Having no interest in something