Here's a comprehensive list for Killington:
1. More snowmaking capacity. Yes, they already make a lot of snow, but there's also a lot of terrain that has snowmaking pipe but rarely gets any attention. They need to be able to pump more water, and have a more efficient system with more fan guns and other fixed equipment.
2. Replacement and upgrade of Ramshead, Snowshed, and Superstar lifts. All 3 are old and Ramshead and Snowshed need more capacity, like a lot more. Ramshead at least needs to be a bubble chair because it's brutally cold, and it wouldn't hurt to have bubbles on the other two either. Ramshead should also probably be extended back to the original summit.
3. Aggressively build more lodging, both within the currently announced Village and Bear Base Camp projects, and in other locations. Specifically, I think the Great Eastern, Home Stretch, and Bearly trails need more lodging built along them. Great Eastern already has some but the others don't. In my opinion, the focus should be on hotel-style lodging at the Village, and the others should be condos and townhouses. Additionally, there should be more frequent bus service on the access road to better serve the existing lodging there.