Family friendly & trendy dining

When we plan to go out for dinner, I like to choose hip and trendy places rather than just going to the corner diner. Since the number in our family doubled up in the last 2 years, now I have to find "family-friendly" and "trendy" dining which might sound like an oxymoron. Of course when you say trendy in NY there comes the at least-half-an-hour waiting lines and that's when I usually lose my husband's interest. He starts eyeing the next door restaurant where he will have his table in less than 5 minutes. I tell him that the next door is not an option and that I'm staying with our beeper in my hand and he frowns at me until we sit at our table.
Enough with the intro, I heard that Rosa Mexicana was a popular place at Union Square so that's where we headed. We had our table right away because we arrived around 7 so there was no frowning to begin with. We started out with guacomole which they make in front of you which is awesome. Not only did they have high chairs and a menu for jr. amigos but they also brought crayons and coloring paper for Tara so I can say they are kid friendly. Plus it's quite a loud place you won't worry about annoying others. Food was good, drinks were amazing and the water wall was a sight to look at.
As we were leaving, there was a young chatty crowd with margaritas in their hands waiting for their tables and it didn't look like they were minding it at all.
The address is 9 East 18th Street (bet. 5th Avenue & Broadway) although there are other locations around town.