make sure you find Cardiff, and not the RAF base St. Athan which is only a few miles to the West.
depending on the runway in use, it can be easy to route down the coast once you have crossed the severn (I suggest you use the bridges as a navigational guide) until you are visual with the airfield.
don't overfly the chemical works near Barry.
once you have met your friends somewhere in the airport, you will need security to allow you back airside once more - you can arrange for this at the information desk.
you need to wear a t-shirt saying you love charlotte church and that you drink brains bitter.
do not look at anyone's sheep in a lecherous way - it may lead to trouble...........and
watch out for the speed cameras on short finals. If you exceed Vref +10 knots the local Hedlu will be waiting for you.