Several of the posts on pricing is way out of date. We just got back and here is the scoop.
ADO Bus from airport to downtown Cancun - 52 pesos each
ADO Bus from downtown Cancun to airport - 45 pesos each
Ferry Ride - 80 pesos each
Bus from ADO Cancun to Chiquila - 87.5 pesos each
Beer, Sol, Victoria - 25 pesos each at Villa Del Mar and Buena Vista, 30 pesos most other places.
Ice - 20 pesos a bag at corner store by park
6 pack Sol or Victoria beer - 90 pesos
Bottled water - 10 pesos small, 20 pesos larger, 25 pesos for gallon jug
Las Panchas behind Hotel Lapalapa - best Empanadas and other Mexican specialties, everything is 10 pesos each, we ate here for 3 breakfasts and one lunch.
Tips are on 90% of the bills - 10% - 15%