Placid Waters is a hopeful name. Pumicestone Passage can look placid at slack tide and run like a river six hours later. Holiday apartments under this slug, if they existed as advertised, were selling the sheltered island — canals, parks, a kitchenette — not a surf break.
Historical listing, details unverified.
Self-catering is a good Bribie pattern because township kitchens beat a park with no tap water. Shop before you get ambitious. Read eat and drink if you will still want a precinct meal.
If you need genuinely still water for a child, the passage foreshores are the planning answer, with all the caveats on beaches. A name on a door is not a swimming assessment.