For anyone still doubting, this worked great for us last week. Real easy to get a taxi to the hotel, do the pre-checkin and check out at the same time. Quick walk to the Atlantis for wristbands and then enjoying the water park.
One word of caution, some of the rides were malfunctioning during our visit and had to be closed for short periods. They all reopened, but there was uncertainty about how long the repair would take and customer service was minimal.