The rift is about where the X is, I suck and got lost a lot, but I can give directions! (I would have posted signs, but I didn't have stuff with me, so I named logs and dropped on the floor! :D)
From the crossroads on the Great South Mountain Highway and "Highway", go east and stay on this road until you find a cave/tunnel with crude fences outside.
Go through this cave/tunnel (it's mostly linear) and turn right when you get out, go up the hill and it's on your left.
Good luck!
Honolulu Sunday 9:34am
Anchorage Sunday 10:34am
US Pacific Sunday 11:34am
US Eastern Sunday 2:34pm
Sao Paolo Sunday 5:34pm
London Sunday 7:34pm
CET Sunday 8:34pm
EET Sunday 9:34pm
New Delhi Monday 1:12am
Beijing Monday 3:34am
Tokyo Monday 4:34am
Sydney Monday 6:34am
Auckland Monday 8:34am
BONUS FUN FACT! There's some nice raging huge spiders around there.