You should try worlds of wonder, Sec 18 noida. It might be closed due to pandemic
In delhi and affordable price Adventure Island, Rohini
Nearest Metro : Rithala
But I would strongly recommend Worlds of Wonder in The Great India Place Mall, Nearest Metro :Noida sector 18
Adventure island, but you have to see if it's open or not
Jurrasic water park - The most affordable one.
Worlds of wonder but check before going
Splash down, just chill water park