Gawton:
HSD(red) – machine built, fun, flowing, nothing technical, downhill BMX track. ~3mins long
Egypt(black) – hand built, steep, rooty, rocky, very tight and techy. gets even harder in the wet. some chicken runs but they are pretty hard too.
Super-Tavy(double black) – machine built, very steep in places but once your used to the steepness isnt as technically hard as Egypt. again, chicken runs around the biggest stuff but they are still hard.
Woodlands – ace fun, ~8 different full DH runs, several extra combinations of tracks. Easy push up or spin back up the fireroad in about ten minutes.
as for the bike, I'll happily ride any track at woodlands on my five and HSD. not sure i'd like to take it down egypt or supertavy but rowan sorrel looked pretty rapid down them on his five.
for either site you'll need to become a member of woodland riders or get a day pass from dartmoor cycles.