Just played Sipapu a couple of weeks ago. Hole 18 is both ridiculous and amazing at the same time. You have a straight wall of trees on both sides of the fairway. It is damn near impossible to get a good drive from the Pro tee-pads.
Parked it (from the pro tee it ended up about 15 feet to the left) with a beat up X-clone. Missed the putt though and I'm still kicking myself for that. You just have to remember to throw down at an angle. It is amazing especially when your disc keeps going and going.
Hole #1 at Thunderbird Paseo in Pheonix, AZ. Over 600' in the long position with an out of bounds creek running diagonally across the fairway that comes into play on any drive from 200' to 400' in distance depending on the line you throw. Tee is at the bottom of a dry river bed. After you make it past the creek you still have a long ways to go to the hole which is about 100' elevation up the side of the river bed well guarded by small trees and thickets with two inch long thorns. Brutal!
You just have to remember to throw at the downward angle. I believe that the wind must have been blowing slightly from left to right on that day and that's what kept the X-Clone on line. But duplicating that shot would probably be very difficult. Just because it happened once doesn't mean that it will happen again.