I've done several types of free classes--aerobics, exercise ball, ....there were a lot of others that sounded too hard for me! In the fitness center there are treadmills, elipticals, free weights, rowing machines, bikes....not sure what else.
For anyone who cares, a scale is not accurate on a moving ship! Really.
Other alternatives--there is a walking/jogging track, equipment available on the sports deck for basketball, etc.
The bread is good, but not worth the calories (except the banana walnut.) Save it for the desserts. Take the stairs every time. My logic is that every little bit helps.