yes, wolf, the triboro bridge does make its vortex there--is that the right word? what do you call the common point in a Y stucture?
but randell's island has been merged with wards island, and the mega island is also home to the NYState mental hospital, and to a hosp for children and to state 'residences' for handicapped children--many of whom have mental or emotional handicaps.
most of NYCity's bridges have pedestrian paths, and can be walked over --you can walk across the triboro to the parks stadiums, or drive there
many have walked over the brooklyn bridge (i always recommend it for visiters) but walking over the George washington is much more spectatular in many ways.
my parents walked across the triboro (when i was a young child) and i rode in a stoller!) i have no memory of the experience, except i love NY's bridges.
(PS--one of my glories is i can see the lovely suspension bridge of the triboro from my living room/kitchen and bedroom windows!)
