"Mr. Wallace and I was out here last to see the ruins of the big fire."
The fire the writer was talking about was the one on August 15, just two days prior. That fire destroyed the Fiske Hotel shown in the postcard, as well as 17 other hotels, 60 cottages, and an estimated 110 businesses. Voyeurs from miles around, just like our writer, came to see the ruins.
More about the fire, with lots of postcards, here: http://www.oldorchardbeachfd.org/THE%20GREAT%20FIRE%20AT%20OLD%20ORCHARD.htm