I ask my students what they've learned during the past hour/hours, and how they learned it. They need to then remember what we did, and it's fun seeing how they describe in their own words the stuff we've been working on. They need to evaluate how well they are doing with the issue we addressed.
Then I ask them what their homework is. That usually gets them guessing, which is good because after they flounder around a bit I can recap what they need to continue working on till next time, and how they might go about doing that. I finish up with a suggestion that they take it to the slopes, mix intermittent practice in with their play.
Last - I suggest that they work on things until they stop seeing progress and hit a plateau, then come back for more lessons. Final thing, thanks and hope you had as good a time as I did.