We were there last week and our pool at the hotel was closed along with all Hilton pools. I would call whatever hotel you wanna stay at and ask before you book. The beaches are open and all piers I know 4sure. We went to Gulf Shores after we left Biloxi and pools were closed there also but beaches open.
Yes the pools are open, and the beaches are open as well. The water is still chilly now though.
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