what to do...

that would my vote too

Make some of them into a you shape, spread the others on the ground inside of it, throw the manure on it and start a jumbo compost heap to be sold/used later as fertilizer.

If you let them rot into the ground, you'll have the best grass ever! A guy I knew ended have a stack of round bales (two high) go bad and never got around to burning/moving them. They rotted into the ground and he said that the grass was incredibly thick and tall in that area.
We did this sort of thing on purpose with our cows with what we call bale grazing. We fed the bales out in the field in a grid, via electric fence. Two years later that area was 4 feet high in grass and alfalfa. The pasture was a 20+ year stand of alfalfa. It works wonders.

Congratulations on your new property! I grew up in at area and imagine it is beautiful.

I wouldn't burn it unless you have access to lots of water, lots of time to watch it, and open space. You could move it out of the way, spread it and let it compost. Eventually, I would till it into the soil if you can. Otherwise, maybe check to see if there is a mushroom farm anywhere nearby that might take it. That is, if you think the bales can be picked up and moved.

When we moved to our acreage, the neighbour had about 30 rotten squares piled on our property. He moved them to a clearing on his land and burned them while there was snow on the ground. They burned for quite a few days...

I myself would let it compost then spread it on my pastor it will really build up the ground.Congrats on you new place I pray you have a wonderful life there.