I was recently in Cuba; and made a few friends with the workers at the resort. I would like to keep in touch with them and hope to send them a letter soon. I did not get their home address but I was thinking to send them a letter through the resort address. Is it ok for me to send them just a Birthday card or will they get in trouble?( because I am a foreigner and relationships with foreigners are not favourable.) I do not have any intention to send them money.