Loads of such roads round here in SE wales. From Chepstow to Usk and then onto Abergavenny via the old road. From Aber there's a good choice through the Brecon Beacons to Builth and then Newtown

All depends on how far you want to go. Only problem in Mid Wales is that there isnt much of a selection of pubs or cafes and some of those that do exist are dire.