Hi Wilma,
If you're going to the Boca Chica area, I recommend the Boca Chica Resort Watersports centre for diving (a.k.a.Dolphin Submarino). There are many wonderful dive sites and full courses are available. The center is managed by a Canadian and courses can be provided in a variety of languages.
For more information contact Diana (who is the general manager) by telephone @ 809-523-4477 or by e-mail...dolphin.sub@codetel.net.do
Jodi