Deep Days with certainly even Deeper Reflection.
It can be hard to articulate or even visually display the real benefit to sledding instead of going to a resort...but this image works.
The benefit of sled access is time. As a rider, you're not constantly having this looming feeling to rush; no one else is there to poach whatever you want to ride next...you're not amongst thousands of jerry's. 
Reflection is powerful, it's extremely healthy and allows an individual to really dial in there fundamentals to improve.