We arrive sat and staying onsite also. Here are a few tips, since you said one child 4 who was little last time.
1) definately take advantage of the early enterance, at DL do fantasyland with her, at dca do toy story, Im not sur eif she is tall enough for RSR but if not do single rider and ride swap.
2) it has been several years, but if child is not tall enough, ask for the cards they give out that say when she comes back use this card as a FP for herself and 5 other in her group. Those are really nice to collect and use in the future, all rides that have a height restriction use to give them out.
3) staying at GC, don't use the private enterance in the morning, it gets very backed up. If you are in the far wing near conder flats use the stair case and you go out right near the bakery and the bag check.
Oh and have a great time, see you there.