A.
We just went to a 4 year-old Dora party yesterday. They had little backpacks for each child (which was also the party favor, and which were homemade), and each one had a plastic bag, some puzzle letters, a mask, a map and a whistle. The map was for the hunt, obviously. First, the kids had to go over the puzzle bridge, made up of those interlocking foam floor puzzle pieces. They had to put the letters from their bags into the bridge, then crossed the bridge. Then they went to lollipop forest, a big lollipop hunt (this is where they needed the plastic bags). Next, they put on masks to creep by someone (I forget this part), and finally, they found the treasure chest, but had to blow their whistles to wake up the dog sleeping on the chest (a stuffed dog). The mom had hidden the candles for the cake in the treasure chest, so that's how the hunt started - with everyone looking for the candles. The treasure chest (a toybox) also had little treasures for each child, like a little frisbee, playing cards, etc.
The mom also had a backpack with a bunch of things in it - ribbons, bubbles, a top, etc. Each child had to feel in the backpack and guess what they were feeling, and then got to keep whatever they guessed. It was cute, and the kids seemed to get really into it.