Where on island are you staying? Red Hook Diving is a good solid op over on East side. I worked on island for almost a year, dove exclusively with them (they were 1/2 mile down road). Most of my diving was East side. Coki is meh, I would not do it without a guide > you can get caught in a current and be tossed around the point. Calf and Cow are popular and OK. Dog is the base of the private island owned by the late Jeffrey Epstein, we called it 'Pedophile Point'. French Cap is by far the best diving I did there, but because its deep and far, it was done only when the guests had been out with the op before. What to expect - warm temps > I often wore rash guard and neoprene shorts, mostly shallow hard bottom, shoals, swim throughs, not a lot of coral, usual Caribbean fish, sharks almost every dive. Sleepy nurse, edgy reef, curious blacktip. Turtles. Found my first and only pipefish there. Like you, I was there for business, traveling alone, and diving was a bonus.