SAB is not zero entry. The wading pool has a sand entry, but the main pool has stairs.
If the OP is asking because they ahve a disabled person in their party, the AKL also provides a waterchair that the person can use to get in and out of the pool with. The CM's will not assist in transferring from the regular chair to the water chair though.
Although I would imagine the Polynesian and GF also have this "service", I'm not sure about it, you might want to call and ask if this is the situation.
Anne