-Catgirls. Basically the servants of the island. They are the most numerous, and go about doing all of the heavy lifting and menial work around the island. Moving goods from place to place, cleaning, and used for various other tasks. As a tourist, they can do pretty much anything they want to catgirls that isn't dangerous, as the tourists usually starts up their own harems of catgirls just for the fun of it. Since catgirls are notoriously lazy and sleep a lot, they have to be motivated to work by either withholding food or plenty of whippings.
-Ponygirls. They are the ones that pull the carts from place to place on the island, since there isn't any cars on the island. In order to keep the island running there are semi daily shipments coming to the island, that requires the catgirls to swarm the harbor and unload the cargo, otherwise they don't eat and get whipped for being lazy. Ponygirls are also used on the race track for tourists to place bets on and race with, using chariots. They get the best food, best lodgings, and ranchers to tend to their every needs while not out on the island pulling carts or racing.
-Mermaids. Self explanatory. They would be on the pristine beach being cute and adorable.
-Doegirls and Bunnygirls. These animals girls are let loose on the islands forest to roam free and get caught on cameras as a nature show. Also tourists can hunt them using tranq guns and claim them as trophies. Accomplishing this feat is very hard since their prey has intelligence. Bagging one of these girls is a nice boost of popularity and pride for any tourist who manages this feat.
-Foxgirls. Also 'Wild' animal that is set loose in the forests, that get to enjoy hunting the doegirls and bunnygirls, molesting and raping the other girls in the wilds and giving the nature shows some action. Foxgirls can get hunted down like doegirls and bunnygirls, and then be trained to assist in the hunt if the tourist has that sort of patience and skill in animal training.
It is also worth mentioning that all of the animal girls cannot cross breed with humans, so there isn't any risk of pregnancy involved. Also how no tourist is allowed to take or kidnap one of them off of the island, that way the owner maintains his franchise. This could lead to some interesting plots, with one of the tourists trying to figure out how his transformation machine works, or trying to smuggle a catgirl off of the island.