I like just mucking around speeding through the streets and trying to top cars out screaming down the second island.
Getting in a taxi and jumping all over the place is cool, trying to pick up cool combo's is hilarious, like say, off the street lamp, over the car, crush that guy and land back on my wheels.
There is also one jump, north of Malibu I think, it goes over the bridge that is near the PCJ Playground, I've tried it with heaps of cars, the bus is the best yet, I jumped and landed on the left wheels, rocked onto the right, then left, right, left, right and ended up back on all wheels halfway down the street.