Have you ever seen a drawing of a dragon? I don't actually believe that they exist, but there's apparently an animal in the Caribbean that resembles the offspring of one. It would be a great discovery if it was true... But there may also be danger involved. So will you look into it? This story supposedly came out of Jamaica. Ask around at a tavern there.
Step 1 - God would be ash coloured:
[Jamaica Tavern] - talk to Barkeep
What are you talking about, dragons? Some deity or something? Perhaps you mean Boyna, but it's supposed to be ash coloured. Ones in this area are green. Boyna is the god of rain, and so if there are too many, there'll be a big flood. If green ones are what you are after, Santo Domingo has many, so go check there.
Final Step - A large green lizard:
[West Santo Domingo] - in northeastern corner
Seems there are green-coloured, dragon-like creatures in the outskirts of Santo Domingo. Search the jagged rocks in the north. No apparent special powers, but then they may just be small offspring.