Check the contour of the land and look for potential trouble due to rain. Check for areas that could flood or become extremely muddy and cause problems. Look for level with enough room to spread out all your camping gear. Look for a site that has trees or shrubs on the side of the prevailing winds. This will help block the wind if it should gust or get quite strong.
Fire is of prime concern at the campsite.
Be sure you have an area for a fire that cannot spread laterally or vertically. When ever a fire is lit at the campsite be sure that someone is assigned to watch it at all times. Keep water nearby for emergencies. Be sure that when you put the fire out you use water and soil and be certain that the fire is completely out, cool to the touch. Embers buried within the pile of ashes have a tendency to reignite later.