Cherish them. Thank them. Write them. Invite them to parts unknown. Share music, art, and food. Celebrate together; cry together. Share your hopes and fears; the mundane and extraordinary; the minutia and the barrenness of your life as it occurs. Savor every single moment you have together.
And don’t forget to tell them you love them — to the point you feel silly. The quality of your friendships dictate the quality of your life.