what are my chances that someone will cancel sea lion?

[livin4maui]

We booked a last minute cruise get away I have had 2 weeks to plan what to do and see in 5 ports. I thought Spending the day at Atlantis is what I wanted to do on Nassau, but after reading so much about bluelagoon and seeing the adorable sea lions changed my mind. Our ship is there 10-7. Only encounter times left are 8:30 and they added a 3:30, but couldn't make the 4 pm ferry and the only other one leaves @6 that day. I am thinlonh about going to blue lagoon for day trip and see if they have any 1:30 cancellations or no shows. Can you buy day. Pass there easily? What are my chances for someone to cancel? Its 4-16-2010 @1:30 I need, just in case anyone booked changes their mind. Thanks wish me luck.