Esselworld :
This is Mumbai's only international-style theme park and amusement centre situated close to Gorai Beach. Special ferries get you across to the park and the entrance fee normally takes care of a fixed number of rides. These include the standard roller coaster and adventure themes, plus a water world section where kids can literally run amok. Summer is usually crowded, but the place also offers low budget monsoon packages and special deals on weekends. Check these out before you go.