Only five Solstice-class cruise ships will be produced, and the first one (aptly named Solstice) has just left port for the sea. Weighing approximately 134,000 tons, the Solstice is over 1,000 feet long and can hold 4,350 people (or about 3,000 paying customers). It's also among the first boats of its kind to have a grass area on the roof.