Beach & pool for baby?

How soon have you guys taken your babies to the beach or pool? We live in Florida and although our baby is barely a month old now I was wondering when did y’all take your babies to the beach or pool (wouldn’t be a public pool)?

We have our annual family trip in the Keys in September and was wondering if it’s too soon, she will be about 5 months by then.

Also, this might be more for the following year lol but any of you have taken your babies on a boat inland if the water is calm? If so around what age?