Let's say if you insists to stay at Perhentian, there is still nice resort called Awana (if I am not mistaken). But I would highly recommend one to stay at Redang.
Enough with accommodation, I will be showing some pictures of my snorkeling experiences over there. Except for the involuntary sun tanning that I had to go through, it was a good experience.
At the Perhentian Island area
A huge turtle
One of the view at Redang Island
Quite a number of fishes surrounded us
A coral. The locals call it Christmas Tree
I wonder why was the fish surrounding that person only...
Morning view at Perhentian Island
On our way to Redang Island
Arriving at Lang Tengah Island
View at Perhentian Island in the evening
Another side of Perhentian Island
Night activity at Long Beach