How close is the Villa Del Mar to the harbor area where the dolphins & manatees are?
While there are lots of threads around here about the wisdom of having dolphins & manatees confined; they aren't going to be freed any time soon.
And in the meantime, your daughter would probably love to watch them.
You would also be close to the Fat Cat. Our guide said that 3-year-olds are OK for the Fat Cat and she can have some Rum Punch without the Rum. (More left over for you that way.)
But there are also lots of threads (look for one by Portland Native) about how much fun kids had at the Shangri La. And you can book the Shangri La through this site & get a free Playa Deal Card if you are staying for 7 nights.