The two mistakes that they made with the Jurassic Park sequels was that they put the same characters back on the island. Why would they go back? And why do we need to see them back there again?
Also, in the first sequel, they introduced the concept of 'Dinosaur Preservation' - What was the point in that? These things are VERY dangerous and should not even be alive now! (The first JP novel (not as enjoyable a read as you'd think!) even pointed out that the things were not really dinosaurs. If a dinosaur breed turned out to be, for example: too aggresive, then the scientists would clone the next batch to be a watered down, docile, more consumer friendly version.)
I'm sorry to go on about it, but the lost opportunity that the JP sequels were, has been bugging me for years.
What they should have done, was have the island deserted. Then maybe some people could stumble upon it. What about a group of international mercenaries who've just pulled off a big score? Maybe they could seek refuge on the island, not knowing anything about the dinosaurs, of course. It could've been like: "Aliens" meets the first Jurassic Park!
But then, of course, we'd have to figure out why the dinosaurs were still alive without that chemical (what was it called?) that the scientists used to put in their food.
Anyone else have any good JP sequel ideas?