Really excited about my upcoming cruise! I am having a hard time deciding on whether or not to book a tour to the San Gervasio ruins. There is so much to see and i know that once i book the tour, i can't back out. Is it possible to take a taxi to San Gervasio? Also, can anyone recommend a tour company that goes to Chacchoben ruins at Costa Maya? Princess offers one but i know that i can get cheaper elsewhere.