Grow hay. Hay is ten occasions harder and develops ten occasions faster than common turf grasses so when freshly mowed in a two inch length appears to be good otherwise much better than any lawn. The only real disadvantages are that hay is coarse, not so comfortable just to walk on barefoot... but would most likely work nicely for racing toy cars... and you'd have to mow it every second day at least, throughout hot wet weather mow every single day.
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