So one one gets confused.
The Rickenbacker Causeway is the only vehicular route to get to Virgina Key and Key Biscayne. That was true when I was growing up in Miami, and its still true.
The cluebox in TAR 7 appears to have been along a narrow stretch of public beach along the southwest side once vehicles are over the bridge on Virginia Key. (IIRC).
If one continues down that road, you will pass the Marine Stadium and its marina on the northeast side of the road, then the Seaquarium on the other side, and then reach the campus of the University of Miami School of Marine and Atmospheric Sciences. Then another bridge onto Key Biscayne. Then there's a county park that covers the northern third of Key Biscayne, the settlement of Key Biscayne itself, then a state park that includes the southern thirs of Key Biscayne. There is a very picturesque historic lighthouse at the southern tip of Key Biscayne that would look great in HD.
The Marine Stadium and marina is oriented NW-SE lengthwise, but an appropriately placed camera position facing northwest would capture the "Brickell Avenue area and downtown Miami, both of which are skyscrapered.
In other words, if the reason for heading there was to show off the HD camera work, WRP has a lot to work with there. The only drawback would be the Marine Stadium itself, which, while it is secluded from wandering eyes from the roadway, it hasn't been used for marine events or concerts since Hurricane Andrew severely damaged that venue in 1992. So I'm not exactly sure what it could have been used for.
There are other islands in Biscayne Bay with interesting places that I could see being used, such as the manmade Fisher Island, full of condos highrises, and another island I can't remember the name of at the moment that was used as a base for the Goodyear Blimp. (I haven't checked but it may still be used in that way).
And of course the Port of Miami (itself a manmade island and not part of the mainland, and is used for both freight and passenger vessels.) As far as Miami goes there's a lot there that wasn't used for TAR 3, TAR 7, or TAR 11. So i will be interested to see what did get used this time.