Here's what was in the confirmation email from NativeWay. Looks like it's $55 not $50. I see $50 on the web site. I'll ask about this.
"Pleasant Greetings from Grand Cayman. and thanks for contacting us
again!
I have reserved a boat to accommodate your party of 25-50 on our
November 22, private charter, "Rays, Reef, and Rum Point" excursion. The price is $55 USD per person.
The tour departs the pier between 8:30 AM - 9 AM Eastern Time. It
completes at around 3 PM Eastern Time. We ask that you check in no later
than 8:15 AM Eastern Time. When you come ashore, look for the person
carrying the sign that says Native Way Watersports. You may also ask for us
at the information booth at the cruise ship terminal.
We provide free use of all snorkeling gear and vests, food for the Rays,
and complimentary punch and bottled water. At Rum Point, you will be
provided with a nice grilled lunch. After the tour, you will have two
options for drop off: back to the pier, or, at 7-mile beach (where you can
taxi back to the pier at any time for $4 per person).
We ask that you provide at least 72 hours advance notice to cancel. If
your ship is unable to dock in Grand Cayman, we will automatically cancel
your reservation, at no cost to you.
Let me know if you have any other questions. I look forward to seeing
you in Grand Cayman on November 22!
Sharon Ebanks"