If you are travelling from Adelaide to Sydney and are camping or caravanning and you don’t want to stop in Mildura, then a great option is Lake Cullulleraine.
Lake Cullulleraine is about 50km on the Renmark side of Mildura. It’s quite a small town but the caravan park is located right on Lake Cullulleraine and has a nice grass verge to the lake.
There are quite a lot of local bird life and is a really nice setting for camping or caravanning. Nearby is a conservation park and there are dirt roads that lead to Lock 9 on the River Murray. There are walking trails around the lake which would be a 10km walk so would take a good amount of time and would not really recommend it in the middle of summer because it gets real hot.