Lac de la Cavayère (Carcassonne Beach) Swimming and other beach activities including Treetop Adventure Park, Volley Ball, Mini Golf, Boating and much more Fresh water swimming in a clean managed lake with Life Guard attendance. Directions. Lac de la Cavayère is signposted from the Cité. Follow signs for the Cité des Oiseaux (city of the Birds, then the Australien Park, Lac de la Cavayère is a mile past the Australian Park.   Life Guard & First Aid Centre     View from the Car Park - Volley Ball Courts     Cycle or walk around the lake distance 5km     The Treetop Adventure Park