Translation of sich schlängelnd

From time to time I listen to my old CD collection. However, most of the CD boxes, meaning the covers, are so full of dust that one can hardly see the image. Taste changes with the age, that is known.
The tour started soon and we first visited the ruins nearby, which was a ten minutes drive. A tour guide introduced us to each and every pyramid and told us stories about practically every stone.
Puerto Madryn was a boring city, but it was the hub to see the Peninsula Valdes, a nature reserve listed as a World Heritage site by UNESCO. We did not know what to expect but new that we would see Pinguins