There is a cool webcam with live pictures of Tavira Island and the Quatro Águas.
The Webcam is situated at Hotel Vila Galé Albacora and shows a river-side view of Tavira Island.
UPDATE: I’ve been building an extensive repository for Webcams from all over the Algarve as I didn’t find any site with a complete collection, there you can see nice beaches like Salema Beach Lagos Webcam or Martinhal Beach Sagres Webcam in case you are interested you can see my collection of Algarve Webcams (I’m still building it, so please expect some breaks)
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I stayed in this hotel last time last time I went to Algarve, and I really loved the landscape… Although you need a car, it is far from everywhere