I'm back on the yellow Goanna trail. That random path into the bushes was indeed the Valley Loop Trail. This place is just confusing. Which path would have you taken?
I make it to the Falls Road exit of the Mundy Regional Park in one piece. From the Falls Road carpark I walk to the bus stop on George Road (about 15 minutes) and catch bus 282 back to the city (about 1 hour).
What an interesting walk. I would definitely recommend visiting Mundy Regional Park and Lesmurdie Falls. The Foot of the Falls trail and the southern section of the Valley Loop Trail up to the Cascade is absolutely worth the trip. The northern section of the Valley Loop Trail and those random Goanna marked tracks are a different story however. I wouldn't bother. The lack of markers and random tracks leading to nowhere is annoying. The spiky bushes overgrowing the trail also ruin the walk. But if you are looking for an adventure the area north of Lesmurdie Brook is probably a great place to explore. Just watch out for massive spiders.
Finally, I recommend wearing some insect repellent while walking around Mundy Regional Park (and probably any bushland area). After getting home and having a shower I noticed a tick was beginning to bury itself into my upper left inner thigh. I blame the area north of Lesmurdie Brook which I didn't like, but I could have picked up the little bugger anywhere. Lucky I wear jockey shorts and not loose fitting boxers. Who knows how far the little bugger would have gone if you know what I mean (I mean my scrotum, how bad would it be to have a tick in your scrotum).