Portugal
Fantastic Portuguese National Park (the largest in Portugal). Camping and climbing are great.
Leave your car by the border with Spain (it's forbidden to park it anywhere else because the area is protected) and walk down the road till you find the river. Are you wearing a swim-suit and waterproof shoes? Then go down the river and enjoy its crystal green lagoons and small waterfalls. When you reach the wooden bridge, come back by the ancient roman road (one mile walk). Otherwise, go to Campo do Geres and walk the entire roman road up.
Mata de Albergaria - Peneda-Gerês National Park, Braga.
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