A TRIP TO Sigurd Olson’s iconic Listening Point always has much to offer. There is the historic cabin, and the ‘portage trail’ to and from. The musical leaf-counting of a red-eyed vireo.The peaceful view out to the pine-clad islands. Making friends with a tiny gray tree frog. The delicate beauty of a pale pink corydalis, my favorite Northwoods plant. The spirit of the place. And the deepening bond of a group of new friends, Road Scholars, exploring the north country together…