Scubadiving

Although not really a known diving destination, there are some decent dive sites available close to Lisbon. Just 40 km away from the city, the town of Sesimbra has a number of Padi Dive Centres, two of them with a five star rating.

With its' south facing bay, diving is available during the greater part of the year. Visibilities range from 8 to 15 meters during winter months, with a water temperature of about 15º C.
The above photo was taken about a month ago, at a depth of 12 meters. The dive site was Pedra do Leão, Sesimbra.