First, I didn't link to the 101 Things list, and since I only named the items by number and not description, it was a bit tricky to navigate.
I've updated the post in that it now includes the link to the list, but I haven't gone back to give the descriptions (yet).
Second, there was at least one place where we arguably have accomplished the goal. I went back through the list, and wherever that was true (there turned out to be a few places), I've updated the list to reflect that.
In doing so, I discovered one item that we can legitimately cross off:
#86: Swim in the ocean with the kids
DONE! Not only did I take the kids to the beach a few times this summer, but we also went as a family last summer. Since the objective for most of the items on the list is that we do these things as a family, this summer's Mick-less outings might not count. But last summer's outings definitely DO count, so that one is DONE!