I went on the June 23 tour and it was a great snorkel adventure. Our captains were friendly, helpful, and knowledgeable. They took us first to Honolua bay where the snorkeling is pretty amazing! The fish and the coral are so colorful. I even saw a moray eel! Then we went to a collapsed pier at Mala wharf. Though I prefered Honolua bay, they were both great and we had the collapsed pier pretty much to our selves, a big contrast with Honolua bat which was a bit overrun with snorkelers from other groups.
I liked the size of our tour group. There were eleven of us, plus the two captains which was so much smaller than the other tours that were in Honlua bay at that time. And while we still had to share the water with those big groups, the smaller group made for a more fun boat ride. It made conversation easy.
Overall, it was a highlight of my trip to Maui. I would definitely recommend Blue Water Maui.