There are a few sights to see if you don't mind some scenery.
1) Drive to Mildura, head over the Murray to Wellington then head to Lake Mungo. Exit via Box Creek Rd to Balranald Rd and then head east along the Murray Valley Highway.
2) Head for the Alpine Way. We went via instructions from a Tom Tom and it took us through Holbrook NSW - definitely worth stopping. There's a whole bloody complete real fish out of water there - a decommissioned Oberon class submarine smack bang in the middle of a park. I kid you not. Actually, I might find a pic of this for you and attach it to this post.
3) Go along the Murray Valley Hwy and consider a stop at the pub at Koetong, they do good coffee and it's quite a quaint little place. Head up the Alpine Way, PLEASE use lower gears when climbing. It's not recommended for caravans but we took ours and it wasn't a problem. Just east of Khancoban is the Murray 2 Pondage with a lookout - stop, across the ravine is one of the Snowy River Scheme power stations. You can drive in and take a tour - the camper trailer will fit, don't worry.
4) After getting through Thredbo and coming to the T intersection at Jindabyne, head for Cooma then take the road to Bega. They're famous for their cheese and they make it - and sell it - right there. Turn into the street, there's an unattended Caltex servo on the right hand side and you can take your camper trailer straight in, keep towards the right and head around the back to the trailer parking.
5) Heading north, look for the Wallaga Lake/Bermagui turnoff to the right - don't take it, but take the next left to Tilba Tilba. No need to stop in Tilba Tilba, but in Central Tilba (about 2km further) they have lots of little boutique stores. It's worth a visit. You might want to hide the credit cards in clothing store on the west side of the main street, they have some nice stuff in there.
6) Continue north, there's lots of lakes and beachy places until you get to Kiama, famous for its blowhole. Drive straight in and park in a bus zone - we weren't chased away from there.
7) Sydney is ... Sydney. The motorways will cost you a toll but if you use the Cumberland Highway, then Pennant Hills Rd you'll get to the F3 freeway which will take you to Newcastle. Here's a decision - coast road or inland? Both have some things to see. There are more rest areas on the coast road.
8) Coast road: turn towards Hexham/Taree and when you come over the New England Highway (Maitland Road), get into the left lane and stay there after the speed limit drops to 80km/h - around the corner and down a bit is a left exit lane to put you over the Hexham bridge and head through Heatherbrae and onto the new highway north. It's good driving for a very long way. Consider the motorcycle museum at Nabiac, Coopernook Forest Park for a free overnighter (a little fiddly to get in to but it's a nice place to stop, pit toilets now though). From there, head to Coffs and consider jumping from the coast road to the inland road by taking the turnoff at Raleigh to the Waterfall Highway which will bring you out at Armidale. If you stay on the coast, it's just more coast once you're past the Big Banana at Coffs.
9) Inland Route - when you leave the freeway on the Newcastle end, you'll see the Hexham/Taree signs as well as Kurri Kurri and Maitland. Take the Maitland road and stay on it. Follow the signs to Singleton, Muswellbrook (big power stations there, Liddel and Bayswater) then on to Scone and Murrurundi. There's a little cafe on the north side of Murrurundi that looks delightful to visit, but the food they sell is worse than dogshit and the coffee is probably dogvomit. Just keep going, take it easy up the hill. Next stop is Tamworth - big Golden Guitar there not far from Maccas (park on the highway). From there on to Armidale and Glen Innes - you might want to stop @ Glen and see the Standing Stones - turn off the New England to the Gwydir Highway and up the hill a bit is a right hand turn with the sign partly hidden by trees. If you go over the hill you've gone too far. Return to the New England and continue north, you'll make the Gold Coast within the next day. There's a nice rest area about 9km north of Glen Innes on the left that is good for a free camp.
Oh, that submarine ...