Be advised this is weather dependent. We were cancelled our first time, but we rescheduled and are so glad we did!! This was 100% worth the hype.
You are going to be cold. Bring towels and something dry to throw over your suit on the way back. It can be choppy too. If you’re prone to motion sickness take a Dramamine and go with it. This is way worth it. It was 25 minutes out to the site and then an hour in the water. Mantas were so close they were touching us. Feels unreal. Water is not too cold but after an hour floating you might be chilly. Fight the urge to get back on the boat early and see it all!!