Happy Days Houseboats also were known as Moon Shadow offers the quality houseboats including a large Jacuzzi spa on the top deck. Happy Days Houseboats are available with luxury 8-12 berth for hire from Renmark on the Murray River in South Australia. Happy Days extra features include extendable electric gangplank, fish finder, reversing cameras, BBQ, large esky, fresh drinking water, gas Heating and solar panels.