Beautiful little gem. I recommend leaving the car at Marrinup campsite to continue rest of the way on foot. There are two roads leading to the campground, make sure you turn left at Grey Rd/Oro Rd intersection if you are coming from Pinjarra intersection otherwise you will end up on very narrow and bumpy road that comes out of Dwellingup. Grey Rd is gravel all the way but wide and suitable for family cars. Follow signs out of the campsite and you will find yourself on dirt road that is quite uneventful but be aware of dirt bike riders and speeding 4WD. The fun starts after you come off the dirt road into the bush. Lots of wildflowers and foliage closing in on the track. Highlight is a series of cascading waterfalls ending up in the massive granite outcrop with big pool at the bottom. Great place to take a break before return leg and have a snack. As you are coming back I recommend climbing up to road by the railway track.