If you have read my post about hostel culture, you will know that sometimes your itinerary will change rapidly because another traveler has inspired you. In the case of Bacalar, I had heard people in Tulum talking about it for days.  Atop of the Tulum archaeological zone ruins, surrounded by tourists, I accidentally overheard a tour guide explain to some older US people that the Mayans were meant to accept Jesus Christ from the conquistadores because otherwise how else could they have possibly developed a lunar calendar?  I decided I needed to wake up seeing Bacalar the next day.