What is the Dig?
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As for the weather at Christmas, it's iffy. For me, I wouldn't plan a snorkeling trip with young kids at this time. Just too cold to be in the water for any length of time without a wetsuit. There are other tours such as the Seaworld Explorer, where your kids would be in a submarine viewing the sea gardens.
Once the water warms up in late March, snorkeling is a treat.