ok start by getting a whole bunch of snow, and i mean a LOT of snow. You wouldnt believe how much snow packs down.
then once you have a lot of snow take a walk or drive around you area, far enough away from your house that no one will suspect anything. Look for construction sites and renovations. The bigger the better but watchout, if it gets too big there might be a security gard in the area.
Then proceed to "liberate" various things that you might need. Barrels, plywood, pvc tubing, a handrail for a stair set, you know, what ever is lying around.
Then arrang your newly "liberated" peices and build the in runs and features. The PRESTO instant park in your back yard.
Now heres for you good dooers (cough*pussies*cough) if aquiring stuff the way i described makes you want to run to church and make a quick confession after taking a cold shower there are other ways to get stuff. Go to the construction sites during work hours and ask if there is any scrap that they are discarding. Tell them that you are trying to get a position in a rap prrogram (thats registered apprentership training) at your local school but you must present a completed project. Dont tell them what it is just that it is a project.
But as a side not this way take much much longer and theres alot more hoops you have to jump threw.