To do a wall ride you need to need to be at scrap yard or construction site,then find a fence,be sure it has a ramp below it,then powerslide the fence at high speed and you can ride it or even better,climb it!
Ok, you have probably tired to do a backflip in your game. And if you havn't, well, you can. And you probably know by now that they are very hard to do. Well, there's a really good spot for those in the, is it, construction site? Something like that. Anyway it's like that and in the pre freestyle. Well, there will be two big pipes holding up one big pipe. Get your acceleration going and go between them. Then there will be a big dirt mound holding up some pillars. Go off that and you can do backflips like no other. And also backflips never go down in points, no matter how many times you do it. Hope it helped.