cairns
cairns has a shit load of tracks, being from cairns myself ive done probly all of em.
if u want dh tracks:
waddlebla
slippery's
stinkys
boi boi
crystals
all these are on coperlode dam road, the highest is crystals i think which goes from somewhere near the top about 20 mins drive approx. none of em are marked so ull have to get someone to show u them.
then you got
kuranda which goes off the kuranda range, good for lots of runs as one run from the top to the bottom then top again is bout 20 mins, at a moderate pass, with a driver and car obviously.
then u got robson's
which goes from the gillie's range, about 40 mins for a loop.
then u got a few smaller tracks that u can walk up.
marino's
agent orange
and ccc track
marino's is off resovoir road, as is ccc, and agent orange is long way up redlynch, most are more freeride tracks with jumps, and a bit of north shore here and there.
then u got the smithfield tracks eg, the 96 worlds track, and a few new ones we are currently building. most of em are closed off at the moment, due to some parks and wildlifes agreement.
if u want xc i cant really help but theres a heap of xc tracks at smithfield.
dirtjump scene is lacking a bit, most of em are gay tabletops that the council built. without giving away all the hidden jumps, its propbly best to goto marinos.
theres probly moe that i forgot to mention, if u want directions goto one of the bike shops in town, edge cycles, trinity cycles, bikeman, pump n pedals and they should be able to give u directions
have fun