Mate i went there not long ago only went up to indian heads as we were only there for 2 days i honestly usesd 4wd once for 30 seconds cause i got caught up on one of the dingo grids lol drove everywhere in 2wd even the inland tracks to lake mckanzie or however you spell it.
And i wasnt driving like some knob churning up the tracks in 2wd it was just a stroll in the park pocking around no wheel spin. thats in a stock standard d22.
Ps have fun getting the sand out when you get back to the real world all those fresh water run outs just fill the underside with sand its a pita to clean
In summer its really dry/hot and the sand becomes like powder on the tracks, Last time I went there 4wd was engaged pretty much the whole time, the bloody tour busses don't help either making these super wide ruts that you then have to push through, I ended up pulling over and letting a V6 pajero go first behind this bus I was following.
My advice is take plenty of bug spray (one that stops sand flies ideally) and you shouldn't need to much fuel I was there for a week and only used a single tank (had 40L reserve in jerry cans though), Lake McKenzie will be packed it always is as said though lake birrabeen is the same thing just 1/10 the people. Indian head sees alot of stuck 4wd's so expect the sand to be really churned up there especially from the morons that try to pull their titanics through to get to waddy point.
the road into kingfisher bay is shithouse (probably the worst one on the island) they might have fixed it now but there were drop offs in the road about waist high last I used it so be careful but the restaurants are not to bad there, one does all you can eat themed nights (seafood, steak ect) and there is another one open for lunch and dinner that does things like pizzas, fish&chips ect which is on the beach with a swimming pool.
Central station I guess is something you might want to see, although I thought it kind of boring reading about how we used to rape the island for its forests and sand since we learnt that in geography at school. You will probably spend most of the time just fishing though by the sound of it so just keep an eye out for traffic, not everyone up there has the common sense to give people on the beach a wide berth when driving past.
if your on your own aroung x- mas there will be lots of peopel to help if needed. but a set of max trax would get u out of any trouble if no one is around. particularly coming back over nagala... Have fun you lucky bugger........
Also agree with this, for sand driving maxtrax are a revelation.