Just seen the post, thought I'd have me twopenneth. My son Max and I went to the Bushmoot for the first time together last year, although he is 13, so I don't have experiencer of taking a little one. However, it was great to see so many youngsters (including little ones like yours), running about enjoying the great outdoors and getting involved in the activities. Bushmoot is great for little ones as long as they are properly looked after and kept away from the sharp things and the hot things, and there were plenty of things they could join in with. In addition, the sand dunes are fun to play in and the beach down the road also looks excellent. You won't have chance to do as much as you would if you were without kids but I bet you'll have a cracking time if you take your daughter. The younger they start to enjoy stuff like this the better I say!
I will be recommending a mate of mine to bring his two under 5's with him this year.
JB