That is rather sporked up.  My high school was in Riviera Beach actually.  There are parts of Riviera that are definitely run-down, but from what I can recall, there was a lot of community effort to resolve that.  They made an utterly badass park for children to play at (the community pool they were developing when I left had a water slide.)  I also seem to recall reading about cheap housing being developed to address the cost of living for low-income families present in the area.

Creating a yacht club and such isn't going to solve the issue in my opinion.  There's a fairly recent entertainment complex called City Place filled with restaurants, clothing shops, and night clubs that was built near Riviera Beach/West Palm Beach, and the slums that surround City Place are still slums.  The city of Tequesta near Jupiter Island (where several yacht clubs and fancy condos reside) is still run-down.  The town of Abacoa (which is much in the vein of City Place) hasn't really brought anything to the town of Jupiter other than deforestation and more traffic.  I don't see why Riviera Beach would be the exception to the rule.