School holidays don't seem as big an issue as you might expect. Wending our way south from Bowen, and the only place we struck trouble was Tin Can Bay. Every other caravan park had free spaces. We went from Brissie south to Evans Head, and are currently at Nambucca.
In Brissie we stayed at the Brisbane Holiday Village at Eight Mile Plains. Whipper snipped within an inch of its life, but has bird feeding every day at 3, and a pool, mini golf and playground. Cleaner than where we stayed last time. Walking distance to Garden City if you want to get your fill of big city shopping. good luck finding a national parks spot in that area. It is solid big city chaos from the border to the Sunshine Coast.