Um...Have a nice life

Tonight I was once again faced with the weird dilemma a person experiences when they move away from a place. What do you say to a person that you more likely than not will not see ever again?

I invited my current student staff members, the student government members I advise, and students that I have interacted with over the past three years to come hang out at my apartment today. I cooked a bunch of food to lure them in because I wanted to have the opportunity to say goodbye.

Normally when a person leaves you say see you soon but I know that chances are I will not see these students, who I currently see almost everyday, ever again so how do you say goodbye? Um...have a nice life; it was nice knowing you.

I just hope that they know I am sincere because working here without having them around would have been miserable. They made this experience worthwhile.