Have a Cooperative Learning Exercise in the library with Explorers as the theme. Each table has a different explorer to research. Each group has to produce the explorer's biography, a map of their routes, a flag of their country (I used to just give them the colored construction sheets of their country's flag, a scissor, tape and a stapler and then they had to figure out how to make the flag). The finished products can be used to decorate your classroom or to make a nice bulletin board.