In September the Helicopter/Dogsledding will probably not be running anymore. I just got off the Wonder a week ago. I had booked that excursion with another operator and a week before cruising they sent me an email that the conditions at the dog sled camp (Herbert Glacier) were too poor so they were closing up shop early (they still offered a helicopter tour). I ended up finding another operator that was still running and thankfully we had amazing weather and got to go. But the musher said they were planning on packing up the next week; I followed her on
instagram and indeed, they just left Norris Glacier a couple days ago. I'm not sure about the one Disney contracts with and if they are still on the glacier, but it is something to be aware of.
At nearly every stop I heard operators talking about closing up and heading home within the next week or so (our Naturalist on the Misty Fjords boat was heading back to college and someone with the Skagway tour company came along to see Liarsville since she also was heading out).
But we adored the cruise. And the towns are very cute, which we didn't have much time to explore. I would be happy to go again and do it without excursions at all lol!