Now that we have a couple EPs and our sims can survive pretty well without jobs, I've built it into someplace worth living in. It now features a public garden, lookout, graveyard, two houses (one occupied), a playground, and a beach hangout/study area. There are a few empty lots for you to do as you wish.
Horses, Deer, and Raccoons will spawn. I placed quite a few small pet spawners too. Cats can find small pets via hunting. The wild animals (horses for sure, not sure about others) don't disappear to an NPC pool- they hang around on the island 24/7. :)
POSSIBLE ISSUE: Paradise initially had an issue where sims spawned at a random spot, ran away from it, and disappeared. These were NPCs being spawned by the world. They...may not ever stop doing this. They aren't an intrusion, though.
You can not use any service requiring a road. You cannot order pizza, adopt a pet, have a maid, etc. If you want to get a pet, you must either make it in CAS, hope for a neighbor to spawn an adoption, adopt a stray, or spawn one with debug commands.
You need the World Adventures version of Paradise to play. Also requires Grant's OMSP. This save game requires World Adventures, Ambitions, Generations, and Pets. Place the files from the .zip in Documents/ElectronicArts/TheSims3/Saves.