I must have dived the blue hole at least 50 times - and everytime was magical for me. I absolutely love the geological architecture and the thought that this used to all be above water - and the mystery of the deep when you reach the limit and recreational diving depth and see there is a long ways to go down further.
However, I would not recommend diving the blue hole immediately after receiving certification as it can be an arduous journey and for a beginner the shallow diving on the reef is so full of beautiful colour and abundant wildlife to see.