Give the kids a backpack (check out http://www.nickjr.com/crafts/dora-backpack.jhtml for instructions for making your own Dora backpack) or goodie bag to put prizes in and lead them to the first place on the map.
Create a forest with green streamers torn and hung from the ceiling, you can make this as simple of elaborate as you would like. Have the kids walk through the forest to collect their present (Stickers) on the other side.
Next create “Crocodile Lake" from blue craft paper cut out in the shape of a small lake add a plastic or plush crocodile to place on the blue paper lake and add grey stones (cut from grey paper) for the kids to hop across and receive their present (bubbles).
In the garden scatter about a dozen fake flowers around an empty flower pot. Tell the kids that Swiper knocked over Dora's
flowers and they need to pick them up and put them in the box. Give the kids a present (Colouring Page)
Make a river with blue balloons in a hallway (you could block off each end with a baby gate or butcher paper taped to the wall. Add fish cut out of craft paper with a lollipop taped to the back. Tell them to swim through the river and find the fish.
Finally print and cut out fox footprints and make a trail that will lead the kids to the cupboard where they will find the rest of the presents that "Swiper" stole.