re: sarah carey
Well, East River Park here between 6th and 10th streets
has them as well, although they're very much in demand
in the summer. They're also a little beat-up, so the
best thing to do is probably bring a finer metal grill
(2.98 at any discount chain store; throw the coal tray
away) and lay it on top of the cast-iron grill.
It seems to me they'd have picnic-type grills in parts
of Central Park and Riverside Park as well, but I don't
know this for sure.