Writing Thank-You Cards for Teachers

<p>Hi all, </p>

<p>So as my high school career is wrapping up, I want to write thank-you cards for my teachers - even some of the ones I had in previous years. What are some things I should include? If I thank them for helping me with college recs and stuff, can I also thank them for their instruction and class in general? Should I tell them where I am headed off to college and what my future plans are (even though they are nowhere near concrete)? </p>

<p>Thanks in advance.</p>