It's my understanding Disney Cruise Lines has not previously sailed this itinerary. Maybe you could dig into other cruise specific sites for other cruise lines that have and see what people say about the ports (like maybe cruisecritic.com). I haven't looked but I expect that Disney Cruise Line has port info and offerings on their website as well. Wish I could be more help.
A great TA to book with would be our own disneyfalcon/Tammy. She is part of the Kingdom Konsultants team, a great earmarked agency who also is a sponsor here. Tammy is a Disney fan, experienced cruiser, and great lady. When you book with any agent you'll get basically the same price DCL puts out there unless an agency has booked a block of rooms they intend to fill. I know from experience that Tammy & Kingdom Konsultants in general will watch pricing continually even after you book. If a discount opens or a price drops they'll be on top of saving you all that they can. Also, they'll help you get all the onboard credits you can get. Great agency. Tammy is an awesome agent. Can't recommend them enough. :wave: