3-4 days Chamonix hiking itinerary
 

I am planning for a 3-4 days hiking heavy itinerary around Chamonix around the end of this month.
I would like to do 2 hikes, upto 5 hours a day.
1. One of the hikes I was planning was the Flegre cable to Lac Blanc, and a stay at the Refuge. However, it looks like the place is really popular, and certain dates might be booked out. So any other alternatives for Refuges with good sunrise/sunsets would be great.

2. Which other hike(s) should I do to get slightly different views(maybe different peaks) from the Lac Blanc one. Is it worth going all the way to Courmayeur and perhaps doing the Val Ferret, but I really couldn't get much information about it.

3. One of the days I plan to do the Aiguille du Midi.

Any other suggestions would be great.