Okay, I saw my UFO. My list is finished.
Having looked at this list, I haven’t done any of these things and the only one that interests me is riding a horse along a beach. I’d like to do it bareback, at sunset, with my boyfriend riding behind me, holding on to me with his arms around me. Ideally the beach and surrounding area would be completely empty of other people too, so that way when the sun was fully down, we could make love under the stars.
However, the closest I expect to get to making this fantasy a reality is the part about my boyfriend and I making love under the stars. We’ve talked about it in the past and plan on it, someday when there’s a warm enough evening: hard to coordinate it when we have a LDR and the only place with enough privacy to do it is where he lives, in NH where it’s more often too cold than too hot). But – that will do very nicely. 
And, while I’ve never ridden a horse on a beach, I have ridden them in meadows, woods and trails.
Other than this, I don’t really have a list of things I think I “have to do before I die.” I pursued my dreams thoroughly and obsessively in my teens, 20s and 30s – it didn’t work out, but at least I went for it full blast, so when I’m on my deathbed at last I can’t see myself saying, “If only I’d tried to be a…” or “If only I’d learned how to…” or “If only I’d visited…”
I don’t know if this is good or bad – it means that once I make love with my boyfriend under the stars, I won’t have any more reason to live, and I’m “only” in my early 40s.