I was just there but I can't remember how much they charged - I want to say maybe 12.00 a person to see the aquarium and have access to the pools, etc. But, I can't remember. I know you can definitely do it cheaper than what the cruise line will charge you (but that was great information Pennie passed on to you). I don't think there's much to see on the Harbor tour, or atleast that's how I felt - it seemed like the driver on the boat screamed the whole time about who lives here and who lives there, etc. But, to me...wasn't a big deal. But, it's whatever you feel most comfortable with - I would tell your hubby to calculate maybe 20.00 per person for that day - money to get over to the hotel and then the tour itself. But, like I said, I'm not quite sure - it shouldn't be more than 30.00 dollars though per person.
Sorry I couldn't be more help!! Have fun!