Way off in the North West of the State at the Tarkine Adventures site is 13kms of custom built, IMBA standard, mountain bike trails for the cycling connoisseur.
Broken up into three successive loops of increasing difficulty, there's something here for everyone, and the trails really do provide a technical challenge when you get into the black section, and some beautiful forest throughout.
However, a word of warning: I last visited in January 2010 expecting to ride groomed trails of superb standard, instead I found myself on some extremely poorly maintained track, with branches and trees down everywhere, and some of them had been down for a loonnngggg time which was a real disappointment.  Oh, and whilst it is free to access the trails, there's no bike hire on site.

MAP

ROUTE OPTIONS

The course is broken up into three successive loops:

1. The 3.5km Wandering Wombat circuit is easy, paved riding that you’d be comfortable to put your kids or your grandparents on, it still goes through some lovely forest and designers have thrown in some optional challenges along the way;
2. The turn off onto the 3km Blue Tongue circuit is found about a third of the way around the circuit above (it returns to the same point) and swinging off here you get to start having some fun on some well designed single track with a few challenges; and
3. Then comes the Deviant Devil at the far point of the Blue Tongue.  This 4km section contains some challenging black trail riding, and at times I felt like the track builders were just in a bad mood and wanted to make the rest of us suffer for it.  That said, despite pushing probably 30-40% of this section I loved it the most.  There is a ‘bail out; point a couple of hundred metres in, but don;t be fooled ... there’s quite a few easier sections beyond the bailout spot.

My advice, given you’ve come all this way, is to ride / push it all, go have a cup of coffee and get back out there and just play in the sections you enjoyed.

GETTING THERE

Tarkine Adventures is 33km west of Smithon, approximately a 25km drive.  It's well signed.  You can also come up from down south (Corinna), like I did, in which case it will take you a ruddy long time.
Access to the site is impossible outside business hours due to a big locked gate, so don't try and be smart like me and get there early ... it's not the most interesting place to sit for two hours waiting for someone to come and let you in, and no that’s not me being shirty after realising on Google Earth that I could sneak in another way.  Go during business hours ... then there’s coffee and toilets available and everything’s above board.

THE ROUTE

WANDERING WOMBAT (3.5KM)

The wombat circuit is a well groomed circuit.  It’s got a few ups and downs, but they’re all well graded and won’t present a challenge to most riders.  Just doing the circuit itself is a pleasant ride through some lovely bush (I preferred it to the actual sink hole attraction) and there’s some lovely little optional challenges and lines (all well marked) for riders to use for a break, or simply to develop skills.

BLUE TONGUE (3KM)

This was my favourite section, though somewhat let down by the sheer number of felled trees over the track, many of which I cleared.  A great combination of fast easy riding and a few tricky bits to keep you alert, and showcasing the North West forests at their best this is the sort of circuit you get to the end of and find yourself wanting to do straight away ... perhaps just a little bit faster than before.

DEVIANT DEVIL (4KM)

This section starts out cruelly, I found myself pushing through thick thistles and then doing a lot of lwo speed bike control as the bikes twisted and coverts back on itself.  I was almost tempted to beat a retreat at the bail out point, but thankfully persevered, because it became much more rideable after this.
The track turns around after a couple of great little drops at an old sawmill site, then starts heading back towards the car park at the bottom of the little valley you’ve been riding along.  Just before you come back out onto the Blue Tongue a large tree has blocked the path and it’s quite hard to follow the trail.

FURTHER INFORMATION

http://adventureforests.com.au/tarkine/attractions
The Tarkine Adventures site has a bit of information, and you can call their number to enquire about the track.

NEARBY RIDES

I don’t know about nearby rides, but the reason you’re probably here in the first place is to visit the main Tarkine Adventures site.  My only advice is consider doing this before the ride, because after the initial adrenalin rush of the slide, I spent the rest of my time ... well not overly impressed and dreaming of how much fun it would be to have my bike down there.