Swimming in Okinawa in March

Hey, we'll be in Naha for five days starting on 18 March and also wanted to go to Tokashiki and Zamami. I know that the beaches will still be closed at that time, but I wanted to ask if people will still be there and swimming. I must also say that I am quite anxious about all the poisonous animals, so I wanted to ask what the situation is like. Is there more panic than necessary, or would it be irresponsible to go swimming?

by Ok_Food5356