After reading all the posts, getting back to the ship an hour before sailing sounds like wise advise. I'll ditch the group if I have to. Taking all the information seriously, I've decided not to do a Dolphin Swim . They only had one slot left at 3:30 and the ship leaves at 6. Sifting through the information on their website makes you think an hour is all you need, but thanks to this site, looks like it takes 2. And that would be cutting it too close too. Personally, am not willing to miss the ship. Hope my travelmates take it seriously too.
Thank you all for the valuable information.