Welcome To the Board. I particularly enjoy having a local business owner on this site. I absolutely see a unfulfilled nitch in the market for people with only a short time to spend on the island (yes...cruisers) that would like to dive and spend the rest of their day shopping, drinking, and/or burning to a crisp at a beach club. I wish you the best of luck and while Scuba Hunt is not really my thing, I will recommend it to my students as an extended version of a salt water weight check with more fun things to do while they work on their buoyancy skills before heading out to big water. With a 4:1 ratio, it actually sounds like a great first dive.
I hope to see you here often and wish you the best of luck on the success of your business. Since you're there....have a Bohemia Obscura for me!
Jay