I'll be crusing on the Ryndam leaving December 6. I've heard that the Mayan ruins at Altun Ha are the most popular in Belize but HAL doesn't have an excursion going there. I searched the internet and found a company belizecruiseexcursions.com, part of Island Marketing Ltd (Cayman) having the exact excursion I want. My concern is, are they reliable? Anyone have any experience with them?