ScubaLady,
Correct me if I'm wrong, but there is a bunch of construction done north of RV, both condos and houses. Building materials are hauled by barges. Where is your concern about damage to the coral reef done by all this barges?
As to South Beach I'm with you. It is simply too huge for AC. There is a difference between building 100+ units (RV) and 3000 units (SB). I agree that SB will put enormous stress on AC's infrastructure and by it's intended style (casinos etc) will change San Pedro's unique atmosphere.