Secret mysterious cryptic present identifier

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Across
  1. 1. opposite of night
  2. 3. short word for types of monkeys and gorillas
  3. 5. where the angel sits on the Christmas tree
  4. 6. opposite of stop
  5. 8. has a trunk and branches
  6. 11. like add, 2 add 3 equals 5
  7. 12. things that are at theme parks, (- s)
Down
  1. 2. exciting event, thrilling, unknown
  2. 4. instead of buttons, do this up
  3. 7. opposite of in
  4. 9. skipping, towing, tug of war
  5. 10. not low