Making a hide for this place is not very viable: one- the birds are already kind of comfortable with people around (it is frequented by tens of families everyday!) and two- all the perches I have seen birds on in the last couple of months happen to be tree stumps/rocks/wires too much into the water and the closest one could get to the birds is just what is seen in my pictures If one can have 800 mm focal length on a 1.6x crop factor body, it might be possible to get close up shots

Thanks guys for the suggestions.