ETA per Jill K's response: Oh yeah, if you are the type to get seasick, it will be miserable. One of our party got very seasick and had to go to the onboard hospital, so it was lucky that part of the voyage was in the Alaska inner passage where the waters were calm, or she would have been miserable for the whole voyage.
Orig. response: I'm so happy for this question!
I was never a cruise person. When I think of travel, I usually think of a more eclectic experience. However, I went on my first cruise last year, and it was a blast.
I don't think of being on a cruise as real "travel." To me it's not really a way to truly experience foreign places. A cruise is essentially a floating hotel with all the amenities. Think of it as a time to be completely hedonistic. There is non-stop entertainment, some of it goofy -- kind of like the games they play in summer camp -- but if you're into goofy entertainment, it's really fun. There are also musicians, revues, magicians, etc. You can pretty much keep busy all day long, if you want to. Or you can just eat and drink.
It's incredibly relaxing, because you don't have to do anything. Everything you could ever want is provided. The staff were amazing, and I have never felt so pampered and taken care of. I expect there are some crappy cruises, but I was extremely happy with my Princess cruise. I will definitely do it again.
And p.s. We had the interior room, which was much cheaper, but even though it was tiny, it was really nice. Since I wasn't with my husband, I didn't need to spend a lot of time in the room having sex or anything, so there was no need for a balcony. With husband, maybe it would be worth paying the extra for a balcony.