I've done both the zipline and snorkeling. I will say that the snorkeling isn't as good as many areas of the Caribbean but it's better than places like Trunk Bay.
The ziplines are fun but make sure you are in fairly good physical shape. There is a lot of walking up steep hills and uneven surfaces. We had a couple of older people drop out because they couldn't take it. However once you do the ziplines you will love them.
I, personally, would go with the ziplines-mule ride-ATV tour but if you aren't prepared or able to do some heavy walking then I would go with the sailing excursion.
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"There is a great difference between being well traveled and just having been to many places." ~Me
Hubby and oldest son did an independent zipline called Los Des Vernos.
It is owned by an American. They had a blast. There are 14 runs and one goes across a river.
This was in 2006 and the cost was about $75.00 a person...you paid in cash when you arrived at the office. It cost $3 a person for the taxi from the port to their office and then then $3 a person back to the ship...
but LDV took care of the cost of the transportation to and from the actual zipline....plus there was a place to swim...etc.
COMPLETES THE FLEET
If it is Carnival and it floats....we have sailed it!
Hubby ... DIAMOND (every ship except the Carnivale)
Me ... DIAMOND (every ship starting with the Tropicale)
20 year old son ... DIAMOND (every ship starting with the Tropicale...he is the only DOUBLE Milestone under the age of 21)
24 year old son ... DIAMOND
We were lucky to try the zipline mule adventure and I highly recommend it...The staff was very friendly and helpful, it really made all the difference.The mules were also super fun, they are sooo cute, great experience for the kids.
Not sure of you ATV tour BUT, beware in a country such as Mexico renting your own vehicle to sightsee. We have a 19 yr. old Canadian fellow being held hostage by the Cuban government for getting into an accident (NOT his fault) with a rented vehicle.
Be very weary of renting vehicles and venturing off on your own in any foreign country.