People have been a bit unfair about Offas Dyke. As long as you know what to expect, it is a splendid and vary varied route. It is not all remote moorland (like the PW), it covers a full spectrum of UK walking. There are excellent upland sections like the Black Mountains and The Clwydian Hills, long, quiet sections of remote sheep country, attractive towns (Hay, Kington), hideous places (Prestatyn, Llanymynech), "seaside" at both ends, a lovely walk up the Wye Valley, history (Tintern Abbey, White Castle, the Dyke itself etc, industrial highlights like the canal aqueduct at Llagollen). Apparently, there are also about 500 stiles, but don't let that put you off - it is part an parcel of UK walking! Do your research, choose nice places to overnight and go for it. You will have a good time (weather permitting.....).