These tours start in Chamonix, not Geneva: you get yourself to the valley at 1,035 m and the guide meets you there. Most are private guides for your own group, which is why the prices run higher than the coach tours from Geneva.
Three camps: a guide on the Aiguille du Midi at 3,842 m, a guide on the Mer de Glace or another glacier, and a shorter food, wine or photo slot for the afternoon. A Chamonix and Mont Blanc tour with a guide usually means the first camp.
