I preformed a very, very, VERY diabolical pure evil funny little trick....
Take all your guests and put them on a small island.
Wait a few in-game days, then put in food, water, benches, and even a small zebra exhibit if possible! After a few more in-game days of the guests enjoying themselves, pick them up and place them near the exit. Then.....
Make the water around the island an exhibit, and fill it with crocidles. Then put some more guests back on the little 'Paridaise Island,' then delete the fences, and oh you know the rest. :w00t