You can either use those leftover large present boxes or acquire a few large boxes from a nearby store. Have the kids figure out how they want their fort to look with passageways to the other boxes. Windows that open up, open down or open out. Have someone that is knowledgeable with scissors cut out openings, use caution when doing so. Use duct tape or shipping tape to keep the boxes together.
Kids can decorate their fort with markers and other ways.
Discuss with kids different types of forts that were built in America, Canada and other countries. Have them do some research on the Internet as to these types of forts. For younger children have them think about different types of habitats that animals use for protection. Whenever your children try a new activity or game, this is your greatest opportunity to tie it into a learning experience. Newspaper, magazines, scissors, plain paper, pencil and glue Have kids go through magazines and newspapers looking for interesting things to cut out.