south wales
Cwmcarn XC & DH
Garw (new loop) near bridgend
Afan (W2)
IMO beast place to ride in wales for local stuff like machen, wyllie etc
North Wales
Snowdon Rangers Path
Antur Stiniog (been up twice and loved it)
Llandegla
Coed
But dont forget in south wales yuou also have FoD which is a cracking day out