For Jehovah's Witnesses?

I am a Jehovah's Witness and I will be traveling to Cuba on a secular vacation. I would like to contact the local congregation closest to Varadero, but I don't know how. Also, as Cuba is a communist country, would this be a good idea? Are Witnesses banned or under persecution there? I have been to Cuba before but couldn't find out how to contact the congregation. I wil only be there a week, so I don't want to cause any trouble for anyone.