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Aluminum foil is the most effective material for blocking radiant heat, especially from the sun.
If the sun bakes you through a window in a southern or western-facing wall or door, partially cover the glass area with aluminum foil. Leave an inch or two-wide area open around the foil to allow some light to come in and allow you to see out. It is most effective to put the foil on the outside of the window to block the heat before it gets into your house. If you put it on the inside, it will block glare and stop some heat, but since the heat is already inside the glass, much of it will stay inside. Another fun family-oriented option is to cut a piece of cardboard to the size of the window.