2 or 3 day belters would be Swansea west around Gower then toward Carmarthen. Any sections between Broad Haven north to Cardigan I could also recommend. For castles start at Harlech in the north and head up - dragons more frequent up there so keep a canary on your shoulder.
I'm aiming to do a short section next year. So much to choose from. I'm interested to hear recommendations of where to go.
Thanks