How big a sled? I've seen people use the lids off the recycling bins round our way.
If you've got access to an old pair of skis you can cut up and a bit of time/know-how then you can bodge together a sledge from them, however they tend to be pretty heavy and best for relatively hard packed conditions. Other than that something with a fairly broad and smooth base is best.
Depending on the quality of the snow you could try making an igloo but realistically the snow isn't likely to be suitable as it needs to be pretty settled to make compact enough blocks.
Local kids around here have been raiding skips for old kitchen unit doors. LOL.
the torso of a dismembered prostitute
Ironic coming from the man who can't figure out how to make something to slide down a hill on.
A big inner tube would work better than a board.