Yes - we capervanned for a week from melbourne to adelaide, and it was ace.
you should go to see the 12 apostles, a rock formation along the road.
Camp at bimbi park (camping under koalas - they literally live in every tree above you)
Airey's Inlet has the Round the Twist lighthouse (depends on how old you are as to how relevant this will be!)
Halls Gap/the Grampians further inland is well worth a visit for a change of scenery and the wildlife; roos, emus, koalas, birds....and for some awesome looking biking trails - it's banned though. you can walk up to the pinnacle....
Driving up to the Otway forest park is fun depending on which way you go - and there's a treetop walk there up at canopy level - also an extreme go-ape type thing (but you need to book ahead).
Eat at movida, amazing tapas. You'll need to book though.
Melbourne Gaol is well worth a visit.
If you've ever watched neighbours, go on the tour. It's a piss take from start to finish and hilarious.
I'll keep thinking too!