More importantly, perhaps, while Palauans seem to drink a lot of beer, they don't drink much of anything else.
If one looks at the total amount of alcohol consumed - rather than just beer - Palau slips down to 42nd place out of 188

The report's authors could not obtain survey data for adults in Palau. So they used a survey of cannabis use among state high school pupils and extrapolated those results to estimate a figure for the whole adult population.