I was messing around in zanzibar the other day trying to figure out how to get to places that i shouldnt. The first place i found out how to get on to is the tower where the active camo is. (what you need - plasma grenades)
To get on top you must go up to the tower and go out towards the ramp. then you gotta jump onto the black and yellow caution divider and throw a plasma grenade right in front of you. If you time it right, you should jump and be at the peak of your jump when the grenade explodes and that should give you an extra boost to get on top of the "shed" (this can also be done with a rocket launcher but its a bit trickyer). NOTE: dont do this unless you have a sniper rifle and/or rocket launcher or else it is completely useless.
http://img.photobucket.com/albums/v427/ShotoCloneX/exploit1.bmp
The second place i figured out how to get on to is the roof of the defenders building
(what you need: rocket launcher)
This is a little harder than the other exploit cause you only get two chance to do it correctly. First off you have to get the rocket launcher. To get on top of the roof you have to go to the right side of the building (near the gate) and go up the slope into the building. Before you go inside, turn right and jump on to the thing above the window. Already you might notice that you are very close to the roof but just barely out of reach. Before you do the next step make sure when you jump you dont hit the ledge of the building (cause that will mess you up big time). Position your self so that you are facing the beach and are at the very end of the window thing. Next, look down and aim for the edge of the window thing. Jump and fire at the peak of your jump or else you will commit suicide. If you do it correctly you should be able to go on top of the roof and have a great perspective of your opponents and their plans. The best thing about this spot is that there is a hole in the roof of the building so you can see into it and guard it from above.
http://img.photobucket.com/albums/v427/ShotoCloneX/exploit2.bmp
Oh and if you didnt already know, you can throw flag thru the gate if the gate isnt open...
I got a bunch of other little secrets and stuff that ill let you know later but learn those first!