My neighbours are from Mexico and last night they had a cookout, we've never really spoken much but they brought us a plate of food(it was very delicious!). We would like to return the favour and I was planning to write a thank you note in spanish, but my father thinks that would be rude.

So my question is; would it be rude to write the note in spanish? I'm certain they speak English but at home they don't prefer it(they almost never speak it whenever I can hear them). My spanish isn't very good but I am learning and from my experience people like to see others interested in their native language.

Also this is the note I have planned so far(please correct me or give me tips to make my note better)

"gracias para la comida. la comida era muy deliciosa. nosotros especialmente gustan el guacamole! nosotros quiero hacer comida para tú también. mi padre quiere hacer lasagna para tú. nosotros espero te gusta."

Muchas gracias para tú ayuda!