Like Smoky the Bear says, Only you can prevent forest fires...
Sparks from a campfire have started many a forest fire. Before retiring for the night, make sure the campfire is out.
1. After most of the wood has burned up, stir the charcoals and ashes with a long stick.
2. Slowly pour some water over the remaining charcoals and ashes.
3. Stir the wet ashes.
4. Repeat as necessary.
1.) No need to build a bonfire, small campfires are just as enjoyable, and easier to extinguish when it's time to go to bed.
2.) Be careful when pouring water on the fire as this may cause smoke and ashes to rise, which can be harmful to your eyes and lungs.
3.) Never leave a burning campfire unattended. Make sure all campfires are out before leaving the campsite.