The number one rule of campsites is to select your campsite before dark.
A protective windbreak of trees or bushes in winter camping is essential. Shade and breeze in summer is equally important.
Inspect the ground for level conditions. Grassy areas are ideal. Avoid rocky or soggy areas, which could be a breeding ground for pests.
If you have a pitch thats on a hard standing or rocky ground you will need rock pegs for your tent or caravan awning
Find out the eastern horizon, and face the tent opening toward the morning sun.
The spot should have good drainage to be free of puddles during heavy rainfall, and should be away from dead timber which may crash on the campsite during a violent storm.
A quick view of the surrounding is always recommended. Do this before dark if possible.

First ask if you can drive through the campsite and pick a site. While checking out the campsites, consider these factors:

Look for a pitch that's away from rubbish bins which will attract insects and other verminand thats with out the nasty smell of rubbish.
Avoid pitches next to the toilets and showers because they will have high people traffic and lights, which attract flying bugs at night. However, choose a pitch that is not too far to walk either
If you're not a pet lover, don't pick a site next to campers who have brought their dog.
If you don't have kids and want peace and quite try to avoid pitches with families
If the campsite is laid out in loops, the better campsites are usually at the end of the loop and furthest away from campground amenities.
If you have electric hookup then you'll need to pick a camping site pitch with a power supply