Diving around Catalina Island is by far better than in the Punta Cana area. This is not too far from Altos de Chavon but not sure if you wanted to do both on the same day.
You will likely be able to buy excursions to these 2 places through a rep. in you hotel.
Be aware though that it is a long trip, especially as your hotel is situated a bit further out.
Not able to provide any info on certification.
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