While the majority of the onboard activities are included in the price of the cruise, some things will cost you extra. These include laundry services, Internet access, and packages within the Lotus Spa, Thermal Suite and The Sanctuary. While the fitness center is free to use, you will pay extra for spinning and Pilates classes, which run about $10 per class. In the Sanctuary, you will be charged $10 for a half day or $20 for a full day. You can also purchase weekly passes for about $105, but they go quick so be sure to reserve your pass on the first day.
For more info, see our feature Ruby Princess Cruise Ship