RV Friendly Parking Boyup Brook Western Australia. Boyup Brook is a small town located in the south-west of Western Australia, 270 kilometres south-southeast of Perth and 31 kilometres northeast of Bridgetown. Boyup Brook is known as the Country Music Capital of Western Australia. It is on the Blackwood River and set amongst undulating hills. Boyup Brook is a very clean, net and tidy town and known for the friendliness of locals. The Flax Mill Caravan Park, Jackson St, Boyup Brook welcomes visitors travelling in RVs. The cost to stay is a very reasonable $5.00 per night for 1 person or $7.00 for 2 persons. There are no facilities, and stays are limited to 14-nights. You can choose to upgrade to a powered site and use facilities – tent camping is also available at the Flax Mill Caravan Park.