Treasure Box Quest -- Clues

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Across
  1. 3. Fun with GPS and ___
  2. 6. Great month for the botanical garden
  3. 8. A _______ cipher
  4. 11. Where starts with a base ____
  5. 12. Dirk can illuminate us
  6. 15. Keyword for the ___
  7. 16. Easy Peasy _____ Sweezy is wrong
  8. 17. X marks the ____
  9. 19. gramana
  10. 20. Pay to upgrade?
  11. 21. Sugar ____ fairy
Down
  1. 1. lower
  2. 2. sing 329.6 till it _____
  3. 4. Knows the keyword
  4. 5. treasure
  5. 7. base of this natural
  6. 9. Where ends with ____
  7. 10. Pyrimidine cytosine's purine
  8. 12. A for Adenine
  9. 13. Corner
  10. 14. Log __ for pun
  11. 18. No better support