Hi Apatche123- Here is as best as I can do regarding airfields in Wales:- L=Light, M=Micro, G=Glider, H=Helicopters
North:- Mona (M, L- RAF Satellite), Rhedyn Coch Farm, Rhualt Emlyns Field (M), Caernarfon M & L, Llweni Park G & L, Llantisilio G,
MID:- Welshpool- M & L
South:- Crymych M, Talgarth G, Usk G, Cardiff L, Margam M, Abergavenny M, Haverfordwest M & L, Swansea M & L, Rhigos G, Kerneys Commander L, St Athan M, L and stored, Cardiff Heliport H,
Can't help you anymore really have been to quite a few of the above re MONA only open weekends- not sure you will get any joy there though- there are other small strips. LAAS have a good website with locations and what is based at some of the above and if any problems getting round same.
Hope this helps