The Natural Park of Serra da Estrela is the highest mountain peak in Portugal with an altitude of almost 2000 meters at the tower (it's highest point), it is the largest protected area and it's the place with lowest temperatures in Portugal (minus 20 degrees celsius). In this visit it's possible to follow the course of some portuguese rivers like the Mondego, the Zêzere and the Alva, they will take you to breathtaking places. Take advantage of those moments of communion with nature to observe it, discovering the diversity of plants and birds. With the snow it's possible to try ski, snowboard or snowmobile. There are several pistes with support infrastructure, as well as synthetic snow pistes for skiing at any time of the year.