A different kind of camping.

Although this isn't in my own experience here we have a Scout Cruise Ship which to me looks more like  a tent on floating structure where these three older scouts have popped out one morning while the middle one is attending to his uniform before they consider the day's activities.

These may involve being on land or travelling in this structure further down the river to an agreed rendezvous point.

The nearest I ever got to something like that is spending four days on a narrow boat being expected to help out.