There are different levels of certification to go diving. Most common is the park open water which requires about 2 days of class time and 2 days of pool time and 4 supervised dives. This will certify you to 60 feet. Alternatively there is a mini 2 hour lesson that allows you to go 30 feet. At least with the first one you have to demonstrate you came stay afloat for 10 mins.

I believe they have to be at least 10 yo.

Yes, you can dive and snorkel.

Most of these places offer refresher courses, but you should also consider doing a shore dive. The first dive I did with them when I certified was an easy shore dive, and would be a great way to get your feet wet again.

If you Google "Cayman Turtle Divers," their website pops up. (Trip Advisor doesn't allow posting the link)

When diving with them in the past, there have been people from cruises on the dives. Most dive shops use the same pier which is on the west end of the island maybe 10 minutes from the cruise ships. I have also seen them do beginning dives but you do need to be certified to dive in Cayman.

we didnt, but we had friends that drove us, so didn't need a hotel pickup.

Hi ClanGill, Complimentary transportation is provided from the port in Georgetown. Our meeting place is in front of the Dairy Queen; you turn left from the port, walk 3-5 minutes, and the DQ is on your right. Our clearly marked van will be there to pick you up. Depending on your port schedule, pick up for our morning trip is 8am, with return to port around 11:45-noon; and our afternoon trip pick up is 12:30pm, with return to port by 4-4:15pm. That is all local island time. Very important to note the ships time versus our local time.

The boats they have seating for six, they can do private charters if requested

Completed Open Water dives with Cayman Turtle Divers: Highly recommend completing the online and pool sessions at home and finishing the open water dives with Cayman Turtle Divers to save time and to be able to enjoy the beauty of the islands while finishing the open water dives. The company was very responsive and helpful when I contacted them. Four in my family were already scuba certified but I still had to finish my 4 open water dives. I had already completed the online sessions and the pool training (and had my PADI documentation from my home scuba company showing that I completed the online and pool training) before arriving in the Cayman Islands. Cayman Turtle Divers staff was wonderful - Gen was my open water instructor and she was very patient and able to make me relax and demonstrated the skills first in an easy to follow manner. We chartered a Cayman Turtle Divers boat for 2 mornings so my family scuba dived with a guide while I was doing my open water dives in the same locations. Highly recommend Cayman Turtle Divers! As for cost - it depends on whether you need just the Open Water dives or need to complete the online and pre-open water skills also.