A vacation on the sea is always a good choice. However many people are not aware that a cruise is not the only way to enjoy this vacation. Check out the private yacht industry.
You would be surprised that if you join with 2 other couples or just six friends you can get the vacation of a lifetime and at a more affordable price that a cruise (ship).
Eat what you like, do what you like, when you like etc.. No schedules!!! Unless that's what you want..
See examples of yachts at http://www.viewyacht.com. This is just a brochure website.