In this scenario, the park has been open for weeks. Whats-his-name never had the chance to make a problem for the park, because he wasn't a greedy sob. You are a guest on a multi-day excursion. There are only a few hundred guests on the island at the moment.
Just as your tour returns to the visitor center, power dies. One of the security men went nuts and blew up the maintenance shed where the circuit breaker is (stupid design IMO, having it away from the main area). Thus power cannot be restored.
The helicopter isn't scheduled to return for 48 hours. And you can't call for help since there is no cell signal and without power the phones do not work.
How do you survive?
No trees were killed in transmission of this message. However, some electrons were mildly inconvenienced.