If you are looking out for once day trip. I think its the best place you can hangout. I always prefer to go with friends.
It is the best amusement park till date in Mumbai region, lots of activities and rides for all age group persons, specially the Shoot n Drop, thunder, enterprise, monster etc which are much much thrilling rides. a good place to spend with your family and friends for a single day. park is lit up nicely at night.
In afternoon we can dodge the heat in ice skating. My personal favourite is top spin. I bet you wont be satisfied how many times even you sit. All in all its a paisa vasool place.