Blue Zoo is phenomenal...I highly recommend it!
How old are your kids? Kids ages 4-12 can stay for free at "Camp Dolphin" which is just a short walk away from the BZ restaurant. We did this last visit, and DD (who has stayed at 3 other kid's clubs) says that one is her favorite. They can stay for up to 2 hours, and apparently you must order two entrees (which I am not sure is fair...I mean, I could order 2 entrees and 2 glasses of water and have a cheaper bill that the way DH and I like to dine...several cocktails, and lots of appetizers and a shared dessert.)
The kid's clubs are usally $11 an hour, so it is a good deal, especially if you have more than one kid!
If your kids are not yet 4 years old, then I would not worry, just go dine early. I have seen children in there. I mean, if you are on WDW property, no one can really get annoyed that kids are around, ya know? The only way I would glare at someone with a child is if the kid was screaming and making a scene and the parents did not take the child outside.
have fun, make sure you try the clams casino flatbread, the crab nachos and the french fries.