how to write a sentimental goodbye letter to your colleagues

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I'll be leaving my present school on May. I teach here for almost 3 years already. I want to leave them with a sentimental goodbye letter before I go. I have a very nice experienced here. I met new friends and companions. I brought glory to this school because I won different contests. I want to make the letter memorable to them so that they will never forget me. I would like also to emphasize in my letter to apologize those teachers I unintentionally hurt and appreciate those teachers who were nice to me. I will surely miss them all. please help me compose this sentimental letter. thanks.