Marconi - you’ll love the Mariner of the Seas, that was the ship my husband and I took for our honeymoon, though we did the Labadee/Ocho Rios/Georgetown/Cozumel cruise. Explore every inch of it, it is so much fun! I was (and still am) in awe at the size of the thing. And unless you drink a LOT of pop (as opposed to water or alcohol) don’t bother with the soda deal - it’s not worth it. The wine and dine option, however, is quite nice!
moonstarssun - I don’t really know about Windjammer cruises (though after this post I plan on looking into it, it looks a lot of fun!) but if this isn’t what you choose, reconsider the “regular” cruises. They aren’t nearly as formal as you think - I spent the large majority of the time in a bathing suit and a pair of shorts over to walk around the ship. While my husband and I chose to dress up for the formal nights, they were never mandatory, and quite frankly, with a dozen other places to eat, I have a hard time thinking anyone would feel that they were opressive and imposing. Yes, the tables in the main dining room are assigned (keep in mind, they are trying to serve 3000 meals in the space of 4 hours, it really makes things easier) but there are so many other dining options, it’s not like you will always be forced to sit with boring strangers. I know that if you ask, they may be able to assign you to another 2-person table if they know it won’t be occupied. That is the only dining room with assigned seating (well, on RC ships, you get seated at Chops and Portofinos, but that’s like any other regular restaurant - you can change tables).
As for potential for boredom…have you LOOKED at the things available on board? Swimming, skating, golfing, rollerblading, rock climbing, road hockey/basketball/volleyball, arcades, clubs, dancing, eating, movies, gym, shopping, “game shows”, theatre, live musicians… if these things bore you, what do you normally do on a vacation? I’m not trying to be rude, I’m just incredulous. All of these things are ON BOARD. The availability of things to do at each port of call (including just sun bathing) is huge. The fact is, no one will FORCE you to do anything. You can even stay in your room all day and sleep, watch TV and movies, spend time with your spouse, whatever. They have room service! Though I do recommend that you get a balcony. We spent a lot of time sitting out there, watching as we approached or left the ports of call, and just having a nice drink and quiet time together.
Anyways, feel free to do what you want - it is your vacation! Just don’t brush off the regular cruises quite so easily. You can have as much fun as in the commercials, and then some!