From what others have said:
1. You can plant some c4/claymores by the bumper cars and post up towards the backend(dont go into the radiation)
2. Plant c4 around the cars on the right of the ferris wheel. Then, from the ferris wheel looking towards the pool, run foward towards the right side, jump the fence, go to the path on the right and right before you see the path that goes left, hide on the left side by the building. Then, when the extraction team shows up, blow your c4 up and make a mad dash towards McMillian, killing any surviving terrorist.
This is my way, but I've yet to complete it. It works 90% of the time though, at least while inside the booth.
3.(plant c4 in the cars between the ferris and bumpers before hand) You see that ticket booth by the bumpers? Run there, crawl towards the farthest back of the booth and wait. Throw any nades that get inside, shoot any soldiers that try to shoot you, leave the soldiers who run pass you alone. Then when the extraction team shows up, blow up your c4, crawl out, run towards McMillian and get him to the chopper.