10) Snorkel canes.

9) A coupon book for discount time in the local hyperbaric chamber.

8) A bicycle pump (compress your own air!)

7) A lionfish petting guide.

6) Anything safety-related from your ex-wife.

5) Chum-scented cologne.

4) A wetsuit knitted by Great Aunt Emma.

3) Waterproof fruitcake.

2) Santa's amazing mask defogger with whiskey scent.

1) Tickle Me Jellyfish.