If hiking in the summer, start as early in the morning as possible. Avoid the heat. Wear reflective clothing and a hat. Do not hike alone. Hike with another person and leave your trip itinerary with someone so you can be located in case of a mishap.
Flash floods can occur with little warning.
Check with a park ranger for current weather conditions. Pack out everything that you pack in. Carry out all trash and food scraps. Avoid feeding wildlife, for human food is harmful to wild animals. Leave the scenery as it is.