Average walkies, where about in North Wales are you ?
High on my list would be around the Anglesey coastal path, especially from Bull Bay to Amlwch, and then there;s the Northern Carneddau from Abergwyngregyn.
My suggestion is to invest in copies of John Gilhams superb guides to the Mountains of Snowdonia
There's four of them in the series, the Northern mountains, West, East and South.
The beauty of North Wales, is that its a very compact area, and if you look at a map, the town of Conway is the Northern most pinpoint.
Dolgellau in the South, your Southernmost point.
My home village of Dyffryn Ardudwy the Western most point, and probably Dynas Mawddwy just south of Dolgellau your most Easterly location, with the start or finish of the Aran ridge
The beauty of all those locations, is that you could visit everyone of them, in under three hours of driving, and every mountain range of Snowdonia lies in that small area.
Grab a copy or two of Mr gillhams books, but my number one fave walk, is from Abergwyngregyn to the summit of Foel Fras, via Drum.
In fine weather, its suitable for everyone, even a couch potato, but its pretty magical.
Good luck,, and order one or two Mr Gillham publications, and you will be spoilt for choice