Pack a whistle and a mirror.Every backcountry camper needs to have in their bag a whistle and a mirror in the event of an emergency. If a hiker becomes separated from the group, the whistle can be used to help find the separated camper. If the event of a more serious emergency, mirrors can be used to signal rescue teams, by reflecting sunlight. Small stuff that can be a life-saver.
Bring maps of the area.Having a detailed map of the area you'll be hiking is critical to a good and safe hike. Park maps are typically available at trail heads, as well as at the Visitor's Center of most areas, or you can find your own topographical maps at sporting goods stores.
Balance your pack properly.Your backpack might feel ok now, but you'll start to notice that it's unbalanced after a few miles and get a serious strain on one shoulder. It's important to try to space out the heavy items in your bag and keep things relatively balanced from side-to-side, and from top-to-bottom.