BBC List Part Two: I've done everything on Mark's list and a few more than Mark by virtue of living in Hawaii as a kid:
30. Trek through a rainforest- We went rainforest camping on Kauai when I was a kid. It was an amazing, and very wet family adventure. I lost all four of my front teeth on the trip, but not due to an accident, just the right age for it.
37. Fly over a volcano- I've actually hiked into Mt. Kilauea with my family. Hopefully, someday soon I can do this again with Mark.
I've also been Whale-watching (#4). We did that when we lived in Massachusetts.

I mostly agree with Mark's "will do, someday" list, but he's on his own for Antartica. Brrrrr.