I (35 and single)traveled with my mom (68 and married--left dad at home) and a group of varied ages, from about 20 to 81, singles and couples. There was something for everyone on the Conquest, and we enjoyed ourselves immensely. This was my 7th cruise, 2nd with Carnival, and I've cruised on Celebrity, Royal Caribbean, and Commodore. Carnival is indeed a "funship", so there are lots of activities, but if you want pampering and elegance, Carnival might not be for you.
Embarkation: We live in Houston, so we just hired a car service to take us to the pier. We arrived at around 11:30 and the ship was not ready, although I had read here on Cruise Critic that others had gotten on that early. We waited for what seemed like an eternity for a wheelchair to take my mom onboard, so I think that process could be handled differently. In any case, we were onboard by 1:30, and we were allowed to go to our rooms after 2. The food in Cezanne, the casual dining room was ok, and we hung out there until we could go to our rooms.
Cabin: We were in an inside cabin on the Riviera deck. The cabin was spacious with lots of closet space. I liked the location of the room also, because we were just a flight of stairs above the exit door for the port days--very convenient.