There are a lot of variables to consider so it's hard to give you an accurate estimate. Just grabbing one random scenario, March 13-17, 2017 (you can't book more than a year ahead), 3 adults staying in one room at Pop Century (a value resort) with a 5-day ticket that include the water park option would cost you around $2000 for hotel and tickets. Add at least $40.00 a pay per person per day for food, probably more if you are going to eat on property a lot. Transportation is hard to estimate so you will need to figure that one out. Pakistani Clothes
This is for a very basic package, the sky is the limit from here.