grass pad
Muffin - I agree with your sentiments about grass.
Whether grass is a problem really depends on your latitude.
My shoes get squelchy (technical term) and socks get wet even wealking across 10m of grass here in waterlogged Cornwall.
I am sure Ibiza and Australia are far dryer but still have their damp moments.
Concrete every time for me I'm afraid (and even that is wet today)
SB