Cancun's hotel zone is 30 km long and has a famous 'L' shape. The short part of the L is the bay between Isla Mujeres and Cancun (the water here tends to be calm with hardly any current).
Each business/hotel on the hotel zone has it's address formed by the km it is located on. For example Aquaworld Cancun is located on Km 15.2. So, this is a good way to judge distances between hotels/restaurants etc.
This tip is provided by supplier M05311