Stayed there with my best friend and his 10 year old son (I think he was still 9 at the time). I love the hotel and have stayed there a number of times. We chose it for this trip specifically because we knew his son would love the shark pool. He had a blast going down the slide over and over and over again! Was extremely crowded when we were there (during the summer), but we all had a great time, anyway.
I don't think downtown Vegas is a great place for kids, so I recommend doing all your sightseeing on the strip, but the Golden Nugget is a great place to stay!