driving on sand dunes is illegal
you can drive up to double island point via the beach nd then go inland to tin can bay via a nice little track...
PS> Landcruiser park is broken into 4 sections, main roads (any car can make these tracks), green (soft 4x4's and AWD's), yellow (more serious 4x4's with low range like patrols and land cruisers) and then red tracks (which is for drivers with big nuts or custom built 4b's)...
You can also camp there, make a weekend out of it... Tis loads of fun...
Also they have a bit call the pig pen, its mud holes and water holes, loads of fun to go driving through...