Just one island. Getting to the airport, through that hassle onto the plane, flight time, getting bags, taxi or shuttle to hotel, check in, check out, get papers signed & learn how things are done with the new dive op...that stuff takes time.
And then, you may feel like you just tasted a sampler bite of the islands. The only model for frequent island hopping I know that works decently is a cruise ship, and there you may be treated like a newbie and not taken to the better sites.
If this trip is a rare thing for you, I'd want to cram in as many dives as I could. Especially if I dove solo, that would mean Bonaire. Your mileage may vary.
Anything you want to do on this trip besides dive?
Richard.