Yep go with the stinger suit - they are very sexy :-) You should be able to hire them when you get your snorkling gear. We have been off the reef a few times snorkling and diving, sometime the charter will absolutely recommend a suit other times, depending on the reef and the likelyhood of stingers you can get away without one. Best thing about them is that they stop you getting sunburnt as well - nothing worse then coming home from the reef and all the backs of your legs are sunburnt!!!

Have an awesome trip!