For Day 3 we headed to Coba in the morning and did some hiking, ziplining, and swimming in a cenote in the afternoon. I learned that...

1. Coba is higher than you think it is so do not look down if height freaks you out like me, because if you fall, you really fall. 
2. Sometimes tour operators will change the itinerary without exactly discussing it with you, meaning you eat breakfast at 7am and lunch at 3pm.
3. Tour operators will also provide extras, like a photographer, that you didn't ask or care for and they'll try to guilt you into buying their product afterwards.