Our last dive was over 10 years ago from Sosua beach out to the reef that was close to dead at that time. BUT... it was an easy swim out and still had some good fun even thou plastic and garbage was caught in it. I think that some effort has been made to clean it up.
Take a banana or two. When at the reef, peel and squish it to make small pieces and the fish appear from no where and will start to eat at the whole exposed banana. It was almost scary with the amount of fish that came out to eat. Remember to bring the peel back with you. Remember that this was over 10 years ago.
Their is/was a dive shop in Sosua that can take you out to another dive site by boat. That may be for a scuba dive but, year ago, the previous owner gave lessons in a pool on scuba. Just enough that most could do the dive.
Don't forget the banana. Very exciting and fun.
Good luck.