Next is the big red balls which you have to knock over. Again all you have to do is jump into the and they roll away. Simple.
Next is the earth quake. To do this you have to grind 4 different poles. North, South, East and West. the first is infront of you as you start the level. Slide down the curvy concrete and go through the passageway by grinding down the left hand pipe. Thats one. The next is as soon as you start the level, go all the way left and there will be the wall which stops you going out of the level obviousley but just before that are two pipes, grind the one closest to the wall. Next, as soon as you start the level, slide down the right hand concrete wall and then grind the pipe straight infront of you. And finally, the last pipe to grind is next to the main road in the same area, it's hard to explain, it's next to the really high concrete steps with grass on them. Once all four have been grinded, this will start the earthquake which will make the bridge collapse stopping the car chase.
The skate is fairly simple to collect. and finally the secret tape is quite hard to get to. A slight tip because it's again, hard to explain, get onto the collapsed bridge and there will be a ramp leading to a rooftop and from there you'll be able to find the tape. :)