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DandyDon:I'll ask a Moderator to move this to Cent America forum for better coverage.
Have you read the State Dept warnings on travel there? You didn't say where you'll be going exactly, but the organized diving I'd suggest for a newbie would be the more developed of adjacent Belize or Roatan.
Kupu:Lago Atitlan has the only dive shop I know about in Guatemala. Can't remember the name but it is in Santa Cruz. Brrrr....the water is cold and I prefer to head for the Bay Islands but if you are in the area it might be worth checking out.
sharkdiver00:The one operator I have used is Pana Divers and have been diving Atitlan Lake for a long time. Yes the water is cold.... Depending on how long you will stay, ask around as you go to Lake Izabal in the Caribbean Coast.