Summer, Where are you?

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Across
  1. 4. Refreshing beverage
  2. 6. Frozen cylinder
  3. 10. "A yellow polka dot..."
  4. 11. Marshmallow treat
  5. 12. Not butter
  6. 14. Pop up tent
  7. 16. Soaking up the sun
  8. 17. Oar
  9. 18. "We didn't start the..."
  10. 19. A time to relax
  11. 20. Boat without a sail
Down
  1. 1. Between two trees
  2. 2. The space between land
  3. 3. Foot wear
  4. 5. Seedless
  5. 7. Protection from the sun
  6. 8. Shadow to stand under
  7. 9. Beach
  8. 11. Nautical
  9. 13. Not pants
  10. 15. Cannon ball
  11. 16. Used to dry