Aveiro, Portugal: a pleasant campsite situated in a coastal pine grove next to the Sao Jacinto dunes reserve, not divided into plots and great for birdwatching. Lots of forest birds, raptors and lots of European Nightjar singing at dusk. Next to the estuary, great for watching herons, waders and waterfowl in general.
Very affordable rates: in high season pitching a tent for 2 people will cost you around 20€. Prices are lower during the rest of the year. There are also several fully-equipped bungalows for different numbers of guests.
Open all year.