Bathed in neon and fiber-optic light, glitzy Fantasy-class interiors add expansive six-deck atriums and a new dimension to the original superliner concept. To keep the fun going, these ships offer an almost wearying assortment of places to have a good time. As times and tastes have changed, the ships have evolved as well, with new lobby bars (except Fascination and Imagination) and Internet centers.