The best place in Wales?

That would be a matter of personal choice and would be influenced by the sort of interests that you have. Some people might enjoy visiting castles and choose Caernarfon or Beaumaris, while other might choose Snowdon or Cardiff. Personally I really like isle of Anglesey and the mountain Moel Siabod.

Dinas Bran in northern Powys (near Llangollen) is a highly evocative ruin of a native Welsh castle and another popular favourite.