NEW YORK (CBSNewYork/AP) — Some Long Island beachgoers may need to think twice about what they pack in their coolers this weekend after a new alcohol ban took effect Friday.

Drinking is no longer allowed on two stretches of the federally-owned Fire Island National Seashore as well as during peak hours at East Hampton’s Indian Wells Beach.

The ban applies to two 300-foot wide stretches between the communities of Atlantique and Corneille Estates in the Town of Islip.

The peak hours ban in East Hampton will be in effect between 9 a.m. and 5 p.m. daily on the main 2,000-foot stretch of the beach, where most visitors congregate and lifeguards patrol during swimming hours.

Both bans were prompted by alcohol-fueled parties on the beaches.

“The beach-goers in the Fire Island seashore have abused the beaches, they’ve trashed it and done unthinkable things there in front of the homeowners,” Islip Councilman John Cochrane told CBS 2’s Tony Aiello last month.

Alcohol consumption already is banned on some Town of Islip-owned beaches.

Islip town leaders told CBS 2 partiers got around a booze ban at town beaches by simply walking to bordering federal beaches where alcohol was not prohibited.

Drinking is still allowed on other Fire Island National Seashore beaches and on other beaches owned by the Town of East Hampton.

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