I'm in need of some basic information for a small hardscape project I'm planning. My plan is to build an area around 30X30 or so in order to put up a playset for my son. I would like to put down some flat stone to raise this area about 6". I would like your advise on what would be the best stone to use for this? Also, what do I use to fill this area in order to raise it? I would like to finish the inside area with wood chips so the kids don't hurt themselves, or is there something better that you recommend? Thanks ahead of time for the tutorial. Also, any tutorial websites would be great.