If staying at Surf City ask Imco as he surfs here often with a local guy from Unuwatuna who is really chilled. Alternatively pop into the Sahana one stop before Galle on the main road from Unuwatuna and have some food then cruise to the beach out their back entrance.
Overview
Atmosphere
Very friendly chilled curious locals.
General
Good wave for beginners really fun can get fast when big. If over 4 feet try towards the hotel side of the beach as it sometimes wraps around the point.