Llyn Geirionydd is one of the few lakes in Snowdonia where powerboats are permitted, so expect a mix of activities on the water. Paddleboarding and kayaking are still popular here, and the lake has easy launching from its shingle beach. Parking is available right by the shoreline. Surrounded by forests and hills, it's also a good base for walking, including trails that link to the neighbouring Llyn Crafnant.