TADA. In my experience caravan sites normally don't allow groups of teenagers/young adults. Ageist but let's be honest, probably a good idea. You might find some specs' on there that can help you narrow down your search. Have a good holiday
Theres a really nice site called Freshwater East in Pembrokshire, for normal caravanning and for camping Its opposite the beach so really handy and also near to a holiday park with a few pubs and things even better! or if u like coastal walking theres lots of different coastal paths nearby. Im not sure of the prices per night, but they have really nice facilities so for a couple nights it might not be too expensive. Hope you find somewhere and have a good holiday!
Well if you can't find the right forum section on here then make sure you have a compass & map when you go camping as Pembrokeshire is a big place and easy to get lost lol
My friends seem to love the gower (although not pembrokeshire obviously), and have also camped near Tenby. That was really nice aswell I think. Don't know any details though.