I can't help you with idea on where to go, but QLD sounds great.

I flew from Adelaide to Sydney return the next day at 36+2. I have been told my belly isn't huge but I did notice the difference in lack of room. My elbow doesn't squish in at my side like it usually does and because I was by the window going over and DH in the middle taking up all the armrest I ended up feeling squashed. I should have/ could have spoken up but he was asleep. It wasn't too bad though and was only about 1.5-2hours. Coming back the flight attendants were great and asked me if I needed a pillow or anything, it was an all female crew whereas going over it was all male. I flew Qantas.

I didn't have any drams and if you can arrange a stop somewhere along the way you should be fine. Everyone is different and depends on how you carry etc.

Good luck in deciding where to go, and the plane flight can be done and isn't too bad.