I would suggested this tour either you see Aurora or not

Our primary purpose for this tour was to see Aurora. The activity of Aurora was strong at that time (end of August), .... It is definitely matter of luck and curtain weather condition together with Aurora activity must match to see it. We were not disappointed. We spent nice 4 hours in the middle of wilderness with two young Japanese guides who provided us with real picture of living in Yukon and its wonderful wildlife. We spent some time roasting marshmallows in a teepee and eating snacks in a yurt. One of them was a vivid photographer ( won National Geography price for his pictures), and gave us a tour through Yukon on his computer. I found it well wasted time, I would suggested this tour either you see Aurora or not. Maybe you will be more lucky than us.