What about Jurassic Planet? An abandoned theme-park world where the players survive some sort of starship crash, and have to make their way over land and sea to the park's control center in the hopes of finding something that will get them off planet, or at least a working transmitter to call for help.
And what if dinosaurs weren't the only thing to contend with in this preserve? What if portions had been seeded with xenomorphs, and the Predators liked to come to play...
You've got some possibilities there. There's also the Land of the Lost angle. Everybody loves them some sleestak served as a side dish of dinosaurs!
