I did 12 hours walking at the easter show when i was about 36 weeks, it was exhausting but so nice to see DD have so much fun and it was one of our last moments as a little family of 3 so its a nice memory.

DD is currently busting a gut to go back to Luna Park, DH took her there one day quite soon after i had DS and she has been talking about it every day since. In fact, it was less than 20 mins ago that she asked if we were going there tomorrow! Hahaha...

I would probably go, you will get lots of rest time whilst your DH takes DS on the rides, and Luna Park isn't all that big once you are in there. It is a short walk uphill to get back to Milsons's Point station, which will probably be your most difficult bit, could you drive instead?