4 – Holland America Line: MS Oosterdam
MS Oosterdam is the second addition to Holland America Line’s Vista-class ships and has the on-board Greenhouse Spa and Salon.
The spa offers a range of facilities and treatments including a heated ceramic lounge, a variety of facials, massage therapies inspired by a range of cultures. They also offer relaxing treatment rooms where you can enjoy breathtaking views whilst receiving your treatments.
My main reason for this ship making the top five was it’s hydrotherapy pool, allowing you to relax into the bubbling embrace of warm and therapeutic sea water whilst cruising to exotic destinations.