How to close a letter to co-workers?

Question

I'm writing a farewell letter to my Spanish co-workers at Subway (not a resignation letter, like a goodbye letter). Most of them are guys my age (about 15-17) and a mom (about 40?). I'm not sure what to say and I don't know how to end the letter (like would "un abrazo" or "un cariñoso saludo" be kinda weird? I'm a girl btw). Would it be too formal to end with "cordialmente" or "atentamente"? Thanks!

Answer 1

This is my standard resign letter:

Estimados Señores:

Respetuosamente me dirijo a Ud(s) con la finalidad de hacerle saber mi decisión de presentar mi renuncia el día de hoy, haciéndose efectiva el XDIAX de XMESX de 20XX, como XCARGOX, último cargo que he desempeñado en esta prestigiosa compañía, desde el XFECHAX. Cabe destacar que esta decisión es tan sólo de carácter personal y quisiera aprovechar para agradecer a XTU SUPERVISORX su atención, confianza y buen trato conmigo. Sin más referencia, quedo de Ud(s).

Atentamente, XYOUR NAMEX

Hope you like it.

Cheers

Bueno! If I ever need to quit a job where my superiors speak only Spanish, I will look this up. - JoyceM, Aug 1, 2011

If you ever do, I hope that you give them the courtesy of a 2 week notice. Is this a notice saying I quit today, citing the date, or is he filling in the date of his last day to work? - 0074b507, Aug 1, 2011

This is a notice saying that I quit today. In my country, when you resign, you have to work at least 2 weeks after you show a quit letter - Animalescus, Aug 1, 2011