I recently had the opportunity to roam around the website for the Greater Miami Convention and Visitor's Bureau. They have a lot of useful and informative information about Miami and vacation planning in the area.
They offer planning guides, lists of attractions, travel advisors, restaurants, spas and golf course, etc. They even have apps with local information.
This may be a good resource in addition to this blog, of course, for information about Miami and the beaches.
I hope you find everything you are looking for and hope you have a terrific vacation!