On the first mission (Sao Paulo, Brazil) learn to drive. After Soundwave tells you that you are done, go forward but to the right behind Grindor and Sideways. Go to the water's edge where there is an invisible wall and continue going left on that wall until you hit the corner by the rock. Slowly pivot around on that point until you are facing directly toward the yellow highlighted area where you were going to meet the Decepticons. Keep going forward until you are out of the actual water. The ground will look like the sky.