Actually four to go. There are 5 islands that make up the main gameplay area, Isla Matanceros, Isla Muerta, Isla Tacano, Isla Pena and Isla Sorna and then the pure sandbox island of Isla Nublar, so 6 islands in total. And currently there are 42 species that can be discovered, plus more coming once they release the new content from the movie, plus stuff coming down the road in DLC.
There was concern about depth before release, but I'm not concerned at all. There is lots to do on each individual island that you'll rack up hours on each before moving onto the next. And the dangers start showing up as you move further into the list of islands.
Muerta has dangerous storms, so I'm imagining I'll be dealing with damaged buildings, power outages, and dinosaur rampages on the second island, plus trying keep my security, science and entertainment people happy so one of them don't go Nedry on me and sabotage something.
The first island, your only worries are the rare occasional power outage and dinosaurs breaking out of their enclosure because they're upset with their comfort and environment of their enclosure.
And even then, only the Triceratops and Dracorex have given me any problems by attacking the fence when their comfort drops into red, so it's not a widespread issue on the first island.
But yeah, as a fan of the series, and dinosaurs in general (who isn't fascinated by dinosaurs?), this game is worth every dollar for me.
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