Balance that off with no airports waiting for flights. No checking into hotels. No rental car issues.
Just the feel of the sea breeze as you cruise the ocean is so peaceful. Take a Bonine and you'll feel ok.
The joy not having to figure out where to go to dinner or select one of the optional restaurants on board if you chose.
The quiet relaxation of being alone on your balcony or a walk along the teak deck watch the world go by.

We chose Crystal because it is consistent and relaxing. No charge for an optional restaurant, espresso or a drink. We find fellow cruisers to be interesting and well traveled for the most part. They have done away with black tie and made it "optional" usually for only one night. Last of all the price was competitive. We have a great agent who always seems to get us extras. PM if you need her help.