How to make a powerful solar concentrator that can cook four or five hotdogs in minutes. The Solar Hotdog Cooker is made out of a thin (1/8 inch thick) plastic mirror that can be found at plastic shops and glass stores.
http://sci-toys.com/scitoys/scitoys/light/solar_hotdog_cooker.html
How to make a marshmallow roaster, powered by the sun. It can be made from readily available materials, and while it is probably a little safer than the traditional method of roasting marshmallows.
http://sci-toys.com/scitoys/scitoys/light/marshmallows/solar_roaster.html
Describes how to make a sun mask and a sun puppet out of yellow construction paper.
http://www.energyquest.ca.gov/projects/sunenergy.html
Instructions on building a solar-powered hotdog cooker.
http://www.energyquest.ca.gov/projects/solardogs.html