Good gosh dude...this is really not as great as you might think it is...Just go in between two buildings or anywhere...it doesnt matter, as long as there arent any people around.
The only thing that happens is the car shakes. If you look in the front windshield, both CJ and the chick are sitting still in thier own seats while the car is violently bouncing back and forth. Its one of the gayest things about the game.
Hotels....do you mean hotels you can enter, or just in general. If you can enter it, then its probably for a mission or something, if not then its just decoration dude....
What is the ocean for? and the sky?