In reply to echo34:
For up to date and accurate route conditions / safety visit the OHM in Chamonix or online. Slopes of the Tacul vary so just ask.
Tour can be done in a day if you are reasonably fit. 2 and a half hours to hut then 3-4 hours for the route. Best to leave very early though so not ideal.
Easy day routes in the Cham area: Aiguilles Rouges have some options such as the traverse of the Crochues, Le Belvedere, Gliere Normal Route and Le Buet.
Normal route on the M, playing on the Petite Aiguille Verte, ice climbing around the Mer de Glace.
Petit Mont Blanc, crossing the Valle Blanche and doing the Toules,the little ridge that precedes the Cosmiques and leads into the hut.
Have fun