Essel World is Mumbai's long-running amusement park on Gorai, across the creek from the northern suburbs. It has big rides, smaller family attractions, and enough scale to make it a full outing rather than a quick roadside stop.
The location is part of the experience: most visitors approach by road and ferry from Borivali or Gorai. Check current opening days and ride availability before setting out, since the trip takes planning from central Mumbai.