Looking for trails/someone to show us around / Sydney/Gold&Sunshine Coast

Hi there!

My girlfriend and I are on a three months trip through Australia and NZ. Unfortunately bringing our bikes was no option and I thought three months would be ok without riding... Turns out it's not!
I find myself searching for Australian bike forums every other day.

This might be a crazy idea, but I was wondering if maybe someone would take us for a ride on a local trail? Obviously we'd need bikes, too... But I'm guessing there are rental companies with decent bikes around?! Or maybe someone even has a spare one?!
Back home we're doing a women's ride every second Sunday... Maybe there's sth like that here, too?

Here's our travel route for January:
Now till Jan. 10th: Sydney
10th to 17th: road trip up to Hervey (any suggestions where to stop and ride/rent a MTB?)
19th to 26th: Byron or somewhere in this area
27th departure for NZ

A little bit about me: my name is Julia, I'm 35 from Cologne/Germany.
I used to be a xc racer in my youth and just started biking again a couple of years ago.
At home I'm riding a Specialized Stumpjumper fully, still going old school on 26 wheels. I'm quite experienced, so I can take on fairly technical trails (but don't have to, mostly love them really flowy). Fitness is a little bit of an issue as I just recovered from a back injury, I couldn't go uphill for an hour and stuff like that etc.
I'm traveling with my girlfriend and she just started biking but is doing really well and improving quite fast. So ideal would be some flowy trail where she can push through too technical stuff or too steep downhills.

I know there are a lot "ifs" in this request, but maybe time and location works for someone!
I would love to meet some local bikers and experience the trails here!

Cheers, Julia