I'm sure the non-parents reading this will have no idea what I'm talking about, but I've become incredibly frustrated recently that every single park in my area is now paved with wood chips.
In my day, they used foamy cushions to line a playground. Or they just used regular pavement, I guess. Obviously, I don't want my kid to fall on hard pavement and break an arm, but I really really hate those wood chips.
Aside from the fact that if your kid takes off their shoes, they are guaranteed to get a splinter, if you have a kid under two who is still in that oral phase, you are guaranteed to spend your entire time at the park grabbing wood chips away from your child seconds before she swallows them.