"Zielona Pętla" in Kalety - green is marked on the trail around Zalew Zielona, surrounding both ponds. The total length of the route is 9 km. In summer it serves as a bicycle trail, in winter as a cross-country skiing trail, and it is used all year round by Nordic walking enthusiasts. An interesting fact on the route may be beaver lodges, as these animals have settled here for good. There is also a pasture for wild animals on the trail, and the ponds are full of swans and other water birds.
There are 5 thematic stops on the route, devoted to tree species, the importance of birds in forest protection, feeding forest animals, forest crops, and beaver lodges.