Hahaha, thanks so much for all of your thoughts, advice, and ideas; there's some great stuff in this thread, and funny too. I'm glad I was able to stimulate such a discussion.
I was thinking that after being on planes and in airports for several hours on our way down that the last thing we'd want to do is get back on another plane (even though it's a short flight). We'd like to experience both the water taxi and the flight (as well as land taxi) during this trip and thought that spending our afternoon traveling on ground and water to our lodging on AC would be a nice little intro to Belize (as some of you have mentioned).
It sounds to me that there are certainly pluses and minuses to each mode, but we're of the mindset that we'll be focusing on the pluses in either case... We're going to be on vacation (honeymoon) and in Belize for crying out loud!!!
I must say though, JZB's comment about all of the water taxi's being covered and therefore the wind and view are very limited, did take a bit of the wind out of my sails with regard to the water taxi method. Is this really true of ALL water taxi's from Belize City to AC? We were planning to do a day trip to some Mayan ruins during our visit, should we just use plane transport to/fro airport and use that day trip as our way to acquainted with travel by land and sea instead, as JZB mentioned?
Another question... is it imperative that we make a decision ahead of time and make our reservations with whichever method we choose, or will we be able to make our decision when we get to BZE without consequence?
Thanks again for all the input!