Does Atlantis port adventure in Nassau sell out?

[Missus_Aitch]

We’ll be in Nassau during a cruise in March, and we’d like to choose our Nassau port adventure only a day or two ahead, once we have a sense of the weather.  Does anyone know how many/what type of excursions are likely to still be available then?  I know everything dolphin sells out — we’re thinking of either Atlantis or something like a waterpark.  We booked Atlantis last time but it was a very cool day and was miserable — trying to avoid that this time without getting shut out.  Thanks!