Some have already been covered, such as honesty, truth, respect, honor, hard work, etc.
My biggest 3 though have to be:
Be Yourself - Be true to who you really are and don't try and reshape yourself to fit in a box made of the standards of others.
Loyalty- Be loyal to the people you hold dear. Don't cheat on significant others, don't rip off family and friends, etc. Keep the bonds that keep you going strong.
Affection - Let those close to you know you appreciate them. Though don't let your emotions 100% rule you, don't be afraid to show them either.