First you switch to rider cam (press 5 on the right side of the keyboard). Then you drive until you reach the really tall mountains surrounding the map. Once on top of the mountains, drive until you get shot like a human cannonball. The bike and guy should stay close together. (But I've only tried this on Bear Mountain in stunt mode alone)
To do a 180 degree turn (half turn) you need some huge air and a long fairly flat landing area. When you are in the air, hold in the lean forward and right or left. You will start turning and slanting but you won't wreck. If you have enough air you will hit the ground when you are facing the camera. Let go of lean forward and left/right the second you've touched the ground and if done correctly you will have done the 180.
Start a free ride mode. Select the desert area surrounded by cliffs and choose any bike and any rider. When you start go forward and soon you will see a cliff. Hit it straight on while going fast and the bike will climb up the cliff. If the rider falls off it doesn't matter, as long as the bike lays on the cliff-top. You will be back on the bike on top of the cliff. If you drive forward you will hit a mine. There will be a bang and you will be thrown from the cliff - higher than the clouds!
To do a nose wheelie, go of a small jump with a clear landing space. Before you land, lean forward until your bike is vertical. Hold the brake button and you should hold a nose wheelie. But you can't try to go over a hill while holding it.
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