The non pattern sections should still be glide waxed for optimal performance. Even the pattern should occasionally be given a going over with a paste glide wax to prevent snow balling up underfoot. This is because a solid wax melted into a pattern will just fill it up, negating any traction completely.
This is a wonderful glacial remnant; the terminal moraine wall of a long gone glacier creates the barrier that allowed the lake to form. Although blue in summer, wintertime saw something more akin to a moonscape. The lake was like a white flat crater, surrounded by black cliffs encrusted with snow and ice.