I'll be in Chamonix in late May and I want to do the hike to Lac Blanc. However, it looks like the Flegere cable car isn't open until June. From what I understand, there are some alternate routes to get to the lake. What would be quickest way there? I did some research and it looks like you can go to Argentiere and there is a route that leads to Lac Cheserys and Lac Blanc from the town. Would this be the best way to get there?