Voyager-class vessels such as Mariner of the Seas will forever go down in history as the first cruise ships with rock-climbing walls and skating rinks, triple-tier dining rooms, nine-hole miniature golf courses, and regulation-sized basketball courts. Mariner of the Seas also has three swimming pools, and more than a dozen bars, many along the Royal Promenade. Despite being a megaship, the allows 3,000 or so passengers to roam the ship with ease.