Horseback riding is one! My dad had a horse when I was a teen, so the people who "boarded" it would let us ride their horses. One time we went on a four day trail/camping trip with the horses, dad, me, and my two brothers (older brother was home on leave from the Marines). The horse I rode was huge (17 1/2 hands), and I'd have to find a slope, rock, or tree trunk to get up. Fortunately, the horse didn't care which side you mounted from, so that helped a lot.
I've never been on a cruise, seen the Northern Lights, or flown first class. Similar but different, I rode in a private jet once that belonged to a "sister agency". It was small, no crew outside the pilot, but the seats were so nice. I'd love to fly first class someday.