I'm down here on the panhandle of Florida near the coast, and fire ants rule the ground. My yard is a pretty healthy mixture of St Augustine grass and whatever else wants to grow with it, and I have fire ants. I treat with bait on a regular basis which always kills the hill by the next day but more often than not just moves it somewhere else. Despite the (comparably) few hills that I have sprout, walking around in bare feet is a no-no because you are almost guaranteed to get a nibble from one or two of them.
What I'm trying to accomplish is an area where my kids can play and get dirty and whatever else outside in the yard. I'm building them a swingset contraption and would love to put it in a spot where they can go to town without coming back in with welts. Has anyone down here accomplished this? I was thinking, and this is not based on any kind of experience, about maybe digging down a foot or so, removing the dirt, lining the area with something, filling it with topsoil or whatever ants don't like, building a small retaining wall and finish off with mulch or pine straw.
Anyone suggestions from those who know what they're doing?