Infinite Jump Glitch
Make sure you have 2 two-handed guns. Jump, and then while in the air switch to your second big gun. If you keep switching them at the right time you will be able to levitate up into the air.
Ride on Water Glitch
anywhere by water (deep)
Jump a dirt bike into some deep water. Press Y right when you fly off. Then swim up to your bike (it will be upside-down floating) and press Y again to get on it. You will be riding your bike on the water.
Fall without Chute
In the game demo or in real game, best if just after a checkpoint saved when in a helicopter as to have many chances at this stunt. When this is done make sure to destroy all turrets nearby so that you do not get shot out of the air. Move to a location above a road or sand (flat ground). Move higher in altitude until "you are leaving the mission area, turn around" is stated. Then jump from the helicopter. At a minimum of 15 feet from the ground, pull back on your left stick and head strait. When you land you will usually be damaged slightly but still alive and without a parachute!
Wheel Through Ground
On a Fukuda BlueBolt ( Road Bike)
Go to any city, find a Fukuda BlueBolt Motorbike and line it up with the road, start driving down the road and hold down (towards your self like you are trying to do a Wheelie) on the left thumbstick. The bike may go flying in the air with you or sometimes without you.
The explanation for this can be found when you shoot the rubber of the back wheel of the bike then preforming the above. The Metal part of the wheel goes through the ground and the road is placed down on the map in parts so when the back wheel hits these parts it will launch you upwards.
This can also happen in a fukuda Tornament (Rioja 02) and a Garret Paladin, the fastest car in the game at the Rioja 05 safehouse.
Costa Verde, Guerrilla 22, Camp Condor
Get Extraction to Guerrilla 22 safe house one dropped get into the Delta MAH-15 Chrimera Helicopter head NORTH EAST towards the Highway. One you have got to the highway, get a car follow the road east. Eventually you should come up some really weird rigged terrain.
Get A B C weapons and the Graple.
Select the grapple and press B to jump, then press left,right,left,right and keep going
It may take a few attempts to get the timing right but when you press left right left right Ricos Jumping animation should replay every time you change weapon causing him to jump again.
Note: You do not have to keep pressing B to jump again in the air,you can use this technique to get to those "Hard to reach places"
anywhere by water (deep)
First you have to have a dirt bike, Then find a jump that leads into some deep water. Drive it off the jump and press Y right when you fly off. Then swim up to your bike(it will be upside-down floating)and press Y again to get on it. You will be riding your bike on the water.
West of map, oil rig
At the South West corner of the oil rig if you run next to the wall on the west side, it should come up with 'X; Climb down ladder' If you press it you can now climb down an invisible ladder to the water. It looks as if Rico is suspended in mid air
When walking around with the grapple gun you may see that you auto-target thin air. If you fire it will just go through it, BUT BE CAREFUL! When driving past these whilst on top of the car, sometimes it says 'O; Jump to car' DON'T DO IT'. I did and you end up in the 'riding car' position in mid air, and you can't jump off or do anything, so I had to reset.