I have booked the Blue Lagoon Beach Day as my port adventure in Nassau. It says 9:30am to 4:30pm. I would like to return at the earlier time - I understand there are 2 return times. Should this earlier return time show for my reservation or is it just an option that you have at the beach? Do all reservations for this port adventure say 9:30 to 4:30? Also, do they provide towels at Blue Lagoon or do you need to bring your own from the ship? Thanks!