In reply to tomdale:
In Snowdonia it's difficult to stitch together multiples of class scrambling on the route of a long walk without it being too contrived. You could fit together an Idwal start (-lots of options there- go with the crowds on Tryfan and Bristly Ridge, or do e.g. Idwal staircase, Cneifion Arete and one of the Grade 3's on the back wall of the cwm to take you direct) to the summit of Glyder Fach. Thence Glyder Fawr, down to Llyn y Cwn and then Nant Peris , cross to Cwm Glas and avoid the punters by using the Grade 3 Parson's Nose scramble to get you onto 'Mount Snowdon' . From there you can head for Yr Aran, by a nice airy route.
Then it is down to Nant Gwynant and a road walk to Cnicht . That'll be a long day. At this point, the scrambling peters out. From Cnicht ,+/- Moelwynion, you can head along the high bits of moorland to Moel Siabod and Capel Curig. Depending on your mood you can slog back up to The Glyderau and your finish / plod along the valley floor, via the Lon Las cycle track, to the base of Tryfan/ or ascend the hills on th eother side of the valley by a bash across moorland to Llyn Cowlyd and thence ridgewalk to Carnedd Llywelyn and back to your start.
Although it's satisfying to carry everything , scrambling whilst carrying a full pack doesn't always make for an enjoyable day out, also scrambling, even though you feel you're moving fast, unless you're Es Tressider or Finlay Wild, you'll probably take longer than walking.
Whilst I'm OK with drinking water from most streams in mountainous terrain in Scotland, here you'll find sheep everywhere, so don't count on finding safe to drink water en route- which will mean a heavier load with water carried.