I am a big fan of gratitude.  So, number 6 on the list is: learn to say thank you in 50 languages (or more).  Bonus points for please.

Also, while I am sure I could look these up and practice saying them, I intend this list to represent languages in which I have had the opportunity and the occasion to personally say thank you.

Thank you. English  Please.

Merci. French  S’il vous plait.

Gracias. Spanish  Por favor.

σας ευχαριστώ. Greek  παρακαλώ.