If you tell us exactly what kind of high level creatures your looking for, and maybe we could help you a bit more.
The Huge Alligators have been taken out of Cuba. They are no longer there. Don't know why... but they were.
Vampire bats can be found in Murky Hollow, Port Royal. There aren't many of them, but they are there. Giant Scorpions can be found in many places including Rumrunners Island.
Unless they've all been taken out of the game, they should be there
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Shhlatkinz 
The Guardians
(remake of The Brotherhood)
Notoriety 40
Pirate Master
Toontown
Cool Corny Electrofoot, Nacho Average Pig, Cool Corny Electrofoot Blak