We've only been there twice, but loved our ocean view both times. The first was bldg. 4400 which had a nice BBQ area at our end of the building, and the sunsets were great. With kids it would be a bit of a walk to the pools, but there is a nice grass play area just around the corner and a bit down the hill to the left.
Second visit was in Building 5100, more distant ocean view at the top edge of the property, far from the lobby, but a cul de sac with pool, BBQ, lots of tables, games and a large grass area for kids to run and enjoy. We did not have any children, so did not notice the specifics of what was designed for kids. Both times, as exchangers , we received a high floor and one of our building requests. We chose bldg 5100 because my mom uses a walker and the pool, and whole area around it does not have steps. There are quite a few steps to the lobby pool, although there is an elevator to the first level, but more steps after that to the pool area.
There is a whole thread here with specific building and unit numbers for NCV. It was helpful in making our request. Also, the TUG reviews mention favorite locations. We loved both our weeks there. They were in January (perfect weather) and February (a little bit of rain), so you will have more competition for the most popular locations. They definitely tried to give us what we requested though. Good Luck!