Plan a ski weekend and stay at a ski in/out resort on hill. This way, when the younger child/children tire, a parent can take them back to the room (or to the hotel pool) while a second adult skis with older child/children. It even works well if you only have one child. I'll...
– only there was no exit for miles yet, so my parents pulled over and we were given a roll of toilet paper and told to go crouch behind a bush. One time, between two doors, back in the station wagon days. We travelled with our dog, without our dog, with coolers, with packed lun...