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Manager Phil Hunt said the old staff caravan was moved on to the pontoon "for a bit of a joke".
The "grass" had originally been a section of synthetic tennis court covering and was rescued from the rubbish.
The caravan contained a bed.
It would be used by his son and partner overnight, Mr Hunt said, and today they were going to move a hot tub on to the pontoon and hold a barbecue.
Mr Hunt said the pontoon had been extremely popular with children over the summer, and on one occasion it had 102 people on it.
Unlike many other accommodation providers, Glendhu Bay Motor Camp had its best summer in years.
Today, it was expecting another big influx, of competitors arriving for the Challenge Wanaka Half, Mr Hunt said.