QE park is actually a great place to ride, I live just near it and ride it a few times a week. I can see why people are saying its no good but if you know where you are going its brilliant.
I love it in the wet too, makes it way more challenging. The climbs aren't particularly challenging but there are some great downhills, although they may be impossible to find without a local.
I would volunteer to show you round but I'm working.
Parts of the Orange trail are good but it is mainly the secret trails that are good such as the old National DH.
Watch out for the warden though if you do stray off the proper trails..
Also I hope you guys are joking when you say "surfaced trails", that would ruin it…