Hi Dave...

A little unknown fact I found out over the years.
Almost sixty (60) per-cent of the professional aviators that retired around the same time I did own:
-one or two aircraft
-one aircraft and one sailboat
Sailing like aviating seems to bring us back to our grass roots. Speed boats are fine if you don't have a mouth full of fillings...

I know a few fellow aviators who share in the cost of a hot air balloon as well. That takes several folks for a flight unlike a light aircraft or an inland water sailboat.
Ballooning is expensive as well because the envelope I believe is designed with a certain number of hours to it. Not exactly sure how it works but they do have to be inspected like an aircraft.
Cheers...Happy Landings...Doug