i know a lot of people here will disagree on this, but some of the higher end ski academies can really help your skiing. Just going out for a couple days with a ski instructor who skis a bit of park isnt going to do you anything. At some of the schools though there are coaches who have a true understanding of ski tricks, sometimes even having a form of certification for coaching gymnastics. Youll train on tramps, go to water ramps, and get video analysis and coaching of your tricks. Its super fucking pricy though and not for everyone. Im also sure that there are still some good coaches here and there out side of the academies, but if you really wanna do it right then that would be the way to go imo.
still though just going out and skiing with your friends can be good too, it certainly wont hinder your skiing. I must say though now that im on my own, there are many times when im learning a new trick that i know would be made so much easier if i had my coach there to tell me what i was doing wrong.