If you like mountain landscapes there’s a lot for you to see in the areas surrounding Melgaço.
It is not the tallest mountains in Portugal but some peaks can reach over 1300m (more than 4200 feet). And I think you’ll enjoy the views and the characteristic boulders covering some mountains.
As you go up you’ll clearly notice the changing of the vegetation and that there are no trees above a certain altitude. There are some water courses and brooks to be found and the locals do know some remote swimming places.
There are multiple ways to explore: hiking, by car, by motorbike, by bicycle, by buggy…
There’s a local company that rents buggies and has buggy tours in some interesting trails in the mountains. Their official site is in Portuguese only but you can contact them by e-mail or web form at http://www.kart-cross-portugal.com/SobreNos/contacto