Just to finish this one off, we've had success!!!
Sadly it's not 550m long and there's no flips into the water at the end, but still a heap of fun for all the kids (the little ones and the big ones
).
run around with the mower and catch the clippings or something similar
use it as a buffer underneath down the edges of the plastic
that's if you get enough clippings
might help keep you all on the runway
Adam
This worked a treat, great suggestion there.
I went down a grabbed a few smaller bales of hay (grass). One was for the sides and the rest to make the pool at the end.
Yep, looks like it should go ok.....
And the crowd agrees!!!!