I have used "Perfo" panels which are rolled into the ground after which the grass re-grows back through the hoes in the panel giving the impression of a lawn but with enough rigidity to tow the machine either by hand or a ride on lawn mower.
You can divide the panels so that they are skid width with a space between which doubles the size if you see what I mean.
The distributor is here:
http://www.s2taviation.com/nweald.htm
They are cheaper than concrete and you can take them with you if you move house !