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Two-hour evening walks , conducted by a ranger , contemplate the fauna and geological history of the area . But is this really enough to make it one of the premier destinations on the south coast of Western Australia . It is pleasant to walk from the swing bridge on the western side of the park along the banks of the creek . Karri is one of the largest living things on our planet . On the western side of this carpark there is a children 's playground and the start of the Stonyford Creek self-guided nature trail - a half-hour loop walk that passes through some remnant bushland and across Stoneyford Creek , incorporating moist eucalypt forest , wattles , banksias , native grasses and gullies of tall tree ferns along the creek banks . It has a population of around 4000 and an average rainfall of 1066 mm . On the eastern side of the carpark is the Torulosa historical stairway which has open lawn areas and offers views over the reservoir . That year a station hand at ' Longerenong ' pegged out the first freehold block on the eastern side of the lake .