In reply to fimm:
A really good day walk that we did was Le Buet -> Val de Tre les Eaux -> Point de la Terasse -> Chalet de Loriaz -> Le Buet. Some sections with chains on the way up the valley, but it's not exposed - would probably have been grade 1 scrambling before they stuck handrail chains on it!
The high level paths along the Aiguille Rouge side of the valley were all pretty nice as well, with amazing views towards Mont Blanc. We did some stuff there involving a bit of messing around and climbing (mostly messing around, though) and a night at the rather lovely Lac Blanc hut.
We found the cheesily titled Cicerone book "Mountain Adventures in Chamonix" really good - had sections on easy walks, big walks, hut walks, climbs and scrambles, proper mountaineering etc.