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Well, there are some weapons. Not a lot of them are lethal, but they'll all at least slow them down. There's a small fleet of vehicles - nothing too fancy since the outside companies took their toys when they bolted. The resort itself can be pretty safe, we just need to get all the systems up and running. What's left of the electrified fence will definitely stop some of the animals.
As for the dinosaurs, the t.rex is probably the biggest threat to the resort. She's the biggest predator on the island now, aside from the mosasaurus - but she's confined to the water. I doubt the herbivores will head this way - too many weird sounds and noises - though a stampede could be rough. And there's the flying guys - some of them are big enough to snatch an adult up. None of them are safe, even the herbivores have their own dangers.
There's a velociraptor running around too, but so long as people keep their distance, she's fine. I know her.