>>2526653this.
There's a ton of places here where there is vehicle river access straight off the main road but it's always rough 4x4 trails normally made by locals just bashing their way through the scrub.
You can't park on the main road and you can't go in without a 4x4 or a trail bike.
picrel track goes for about 8km through rough terrain before meeting a larger river with a lot of cool spots and swimming holes along the way, proper 4x4's only with steep climbs up and down river banks, 2ft deep potholes and big boulders