At 30,277 tons, Princess Cruises' Tahitian, Pacific and Royal Princess ships appear positively tiny beside their mega-ship fleetmates. In reality, they are medium-sized ships that entered service for the now-defunct Renaissance Cruises. With their entry into the Princess line-up, real choice is available to Princess passengers -- a true alternative for passengers who prefer the clubby atmosphere of a smaller "boutique"-style ship, yet one that has big-ship features galore.