The casino also shuttered most of the posh year-old hotel's 800 rooms during on those days last March. They were reopened when bookings picked up over the summer.
The hotel says the Water Club will cater to suites and special events during the middle of the week.
The lower demand comes as Atlantic City's casinos have struggled with a weak economy and increased gambling competition in Pennsylvania and New York.
Information from: The Press of Atlantic City, http://www.pressofatlanticcity.com