If you come south on the ICW just get south of the Riverbreeze Park boat ramps in Oak Hill and you will begin to see all the crab trap floats off the channel.
When you pass the last east clinker island around marker 13 and the clam leases on the west side of the channel, the lagoon opens up to what looks like a large bay. There's lots of traps out there.
The traps are everywhere but most are on the channel edges, on both east and west sides, all the way to the Haulover canal. If it were me I would try between the west side of the channel and the clam leases at Lefil's point (last point with dwellings on it) or behind the east clinker islands south of marker 7. The crabs love eating my baby clams and that's where I have seen the most while fishin.
There are also some rock piles between the west side of the ICW channel and the clam leases which occasionally hold some nice mangos and an occasional "keeper" grouper.