I think $190 is very decent too. Don't forget that INCLUDES entrance to water park for 2 days for a total of 4 people. Consider a water park entrance to be AT LEAST $20/day and that would be $160 total just for the water park entrance.
The best way to save money here, IMO - is to bring your own food. Ours, Niagara Falls location, has frig and micro in every room. We usually bring leftovers for dinner on arrival night (calzones, pizza, pasta, mac n cheese, we even bought and brought fish fries last time) and sandwiches (usually in the car on the way there) for lunch on arrival day. We bring bagels and donut holes for breakfast in the morning. And then we usually do buy lunch on our check-out day (easier since we're checked out of the room at that point, although we usually have grapes or chips in our bag so that we can split a few of the meals and not buy one for each).
I think that's a great rate. The best rate I ever got (on Expedia) was $155/night and that was 3 years ago - haven't seen that one in a couple years.