We went out last week with Captain Roger on the SunBaby glass bottom boat. Very affordable and will pick you up wherever you are. We were rookies too but it didn't matter with Roger and Kirk, they showed us everything and we even got to hold a handful of creatures.
The length of the tour was undetermined and they were not rushing us at all. They were having just as much fun as us out there which makes it a cool friendly vibe. Also I think Kirk could be a professional ocean photographer. We gave him our underwater camera and the shots he got were unbelievable. It was definitely one of the highlights of our trip. A really good value. The ph# is 876-430-1868