It's a secret!

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Across
  1. 3. Too many steps without dribbling results in this
  2. 4. Luggage
  3. 7. Transportation sometimes called a "bird"
  4. 9. S'mores time
  5. 12. Beach wear for your feet
  6. 13. Turf to practice your short game
  7. 15. Shades
  8. 17. School of Witchcraft & Wizardry
  9. 18. Multifunctional
Down
  1. 1. "Just keep ____", sang Dory
  2. 2. National Lampoon's Christmas ____
  3. 5. Hertz, Avis, e.g.
  4. 6. Home town of the Padres
  5. 8. Week off from school
  6. 10. It warms the Earth
  7. 11. Catch some waves and rays
  8. 14. Who you love MOST in the world!
  9. 15. Skin protection
  10. 16. 3rd largest US state
  11. 17. Place to relax and soak