Small waves and chop. With 5+ Bft and S to SE wind it is nice for wave riding. Due to limited space it is not possible for more then 4-5 kiters to kite.
Water 15°C and air 10-18 in winter; you need a 5 mm wetsuit, shoes and gloves in January and February. In the other season 3-2 mm wetsuit with short arms. May to August only shorts and lycra. All year round surfing possible.
Drive west from Cagliari to Sant' Antioco. Either along the south coast via Pula or via Carbonia, then to Sant' Antioco. Once you passed the bridge onto the island, drive south until you get to Coequaddus. Park on the beach.