Camp Time set up a small tent for the kids to pretend to camp out. Take small dowel rods and glue cotton balls to the end for roasting marshmallows. I've also purchased a bag of pet rodent bedding made of either cedar or pine, although I like the cedar a bit more, and placed handfuls in bowls about the room to give the class a stereotypical forest smell. First put down a sheet of blue bulletin board paper. Children can make rocks to go around it by covering boxes with paper bag paper and sponge painting them black.
Children can also make stuffy fish to put in the pond.
Add magnets to them and the children can fish for them using poles attached to magnets on a string. Also add ducks to the pond by coping duck pattern and attaching them to coffee cans covered with green paper. For a science activity with this activity have children predict and experiment with different magnets to see which one is the strongest to put on their fish. Children can graph their answers to see which magnet is the strongest. Allow the children to have nap time in sleeping bags around a pretend campfire.