South Florida heat and birthday party issues

It’s my granddaughter’s one year birthday August 31 of all days and we live in South Florida. We wanna throw her a party by the beach with some picnic tables grilling areas may be a covered pavilion and also close to the water as we could walk to the water if we wanted to go swimming. Would love some recommendations it would be for about 30 to 40 people. Lake Worth West Palm Beach Wellington Delray would be the furthest.