When I was growing up, we always had a large family pool. We used a ladder to climb up onto the half opened garage door, then up to the roof for sunbathing and jumping into the pool. So unsafe I know, but remember I was a kid growing up in the 60's where bike helmets, skating knee and elbow pads didn't exist, and we actually played outside all day.
This would have been something my brother and I would have done, had we only thought of it.
"When parents of teenagers go away on vacation ....."