Lizzie ~ Hit Walmart and they will have some water shoes for <$10. They are worth getting. The current is very strong with slippery rocks. I don't think Crocs will work for the climb.
I think you should at least check out CTI, otherwise you might always wonder. You can always catch a cab back if you want to leave earlier than 4pm. The two resorts are close together and it will cost about $10 for the ride back to CSS. Remember to negotiate before getting in the cab.
Juliann & Jeff
Jamaica Soon Come