as said many many many times before on this forum!
the new DH track is very rocky, and would take it out of you on a HT.. but it can be done, ... look at the race a few weeks back 3rd place was taking by a SS HT...
tracks such as travs diamond (track 7) and creasy's climb (13.. the top section is probaly the best and flowest track at you yangs)..
are fairly smooth and good warm ups, also is boulder.
alot of the others can be a little to 'flat'... but it depends what your into.
lactic acid is also a fairly nice run on a HT, few loose and scary sections down the bottom, if your carying speed.
and for the record, i used to ride the whole place on a 4hun, with 130mm up the front