Your friends should think about doing the book and pool work at home before the trip if they want to get certified.
What type of hotel are you looking for? Are you wanting to have an all-inclusive and activities, beach, etc?
With a group your size, most larger dive ops will give you your own boat and take you to snorkel. They know the best spots and will take you out to them. Coral is not close to shore in Cozumel, so shore snorkeling is limited to coral rubble and sand. There are fish, but it is nothing like out on a reef.
If you are staying at a south resort, they can take you to Columbia shallows.
If you are staying at a north resort, they can take you to Chankanaab or Paradise shallows.
As far as Resort courses... realize they do not count towards actual certification.
It is best to do them with a real instructor, don't go with the cheapest you can find. You get what you pay for. A real instructor is going to be patient and safe, not rush you through.
Go to your local dive shop to buy good dive masks that fit. If your masks leak, you will not enjoy even a second in the water.
weather.... August is hot and humid, and in the middle of hurricane season. That does not mean you will have a hurricane, but it does mean you should expect rain showers, possibly every day for a short time, maybe 5 minutes one day, maybe 2 hours another. You can still dive and snorkel unless the seas are really rough.
thx Robin~
i think they r not ready yet, they just want to taste the underwater feeling b4 moving on for license

all-inclusive is definitely wht we r looking for, i think we will focus on 3star to 4star resort located in cozumel.
i dont hv any idea for staying at south or north, any suggestion?
If your masks leak, you will not enjoy even a second in the water <-- i'm totally agree with this statement

---------- Post added June 19th, 2014 at 12:04 PM ----------
u r right, i'd better go rent a car, thx Karloss~Speaking from memory the ferry is around 10.00 usd per person one way. I don't know about taxis on the mainland, you MAY be better off renting a car. I am sure some others will give experience on that.
---------- Post added June 19th, 2014 at 12:07 PM ----------
sounds good, thx Jerry~I have not done this, so I can't speak for the quality of the operation, but there is at least one car service which will pick you up from the ferry dock in a van and take you to the ruins. A private tour type of thing. I found that while googling for a possible day trip while planning a cruise with a stop in coz.
here is a link i saved:
Chichen Itza Private Tour for Playa del Carmen
Again, I have not used this service I found them looking for an excursion from a cruise ship but the timing would not work. They also do similar private vans to tulum and/or coba.
The reason this looks appealing to me is that you get your own schedule and your own van. the total cost is not bad for 4 persons or more.
good luck,
Jerry
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