I dive Riviera Beach (WPB) a lot but I’m a snowbird, there are plenty of members in that area doing it year round.
You don’t say if you are looking to do shore or boat dives. Everything you need to know about Blue Heron Bridge is there up on "Dive Sites" and first and foremost is do it at slack high tide but being a weekend it will be crowded :( I always do BHB on a week day and since I’m driving a camper I can get away with parking in a boat trailer spot, if you do it with a car you will get ticketed.
For boats in that area I like Jupiter Dive Center, Pura Vida and Jim Abernathy’s Scuba Adventure