We (and toddlers) stayed in the B building. Balcony looked at the big pools and the front door opened overlooking the kiddie pool.
The staff at the Hyatt Kids Club were great. We didn't leave our kids there for the day, but our kids played in the play area and the staff let them bounce around inside doing stuff here and there. Each evening (I think at 7pm), they do a short kids show in the big theater. It is silly and generally non-nonsensical, but our three kids (4, 4, and 2 at the time) loved it for reasons that defy understanding. They do musical chairs and generally act silly for 20 or 30 minutes. The same staff at the kids club do the nightly kids shows.
You've probably already read this, but the ocean in front of the hotel won't be safe for toddlers (or adults). The surf is big. Our guys made lots of sand castles and would go out into the water up to their knees, but even then, you really had to watch out for the random rouge wave even that shallow.