The consumption and possession of alcoholic beverages by persons 21 years or older is permitted within Point Reyes National Seashore.  However, all public use areas within the park are closed to the possession of receptacles with a capacity of five fluid gallons or more which contain an alcoholic beverage.  The behavior induced by the consumption of excessive amounts of alcoholic beverages may adversely affect the park experience of other visitors.  Parties with alcohol in large containers (i.e., kegs) have consistently caused problems in the past including rowdy behavior and vandalism.
36 CFR §2.35 (a) (3) (i)