Frozen margaritas by the pool on the Seabourn Quest
Obviously, this is a rather cruise-specific experience. But I include it shamelessly because, frankly, it is one of the reasons you cruise. The deck pool on the Seabourn Quest may not be a big one - it's more for cooling off than working out - but that's fine. Because after one of their frozen margaritas, you'll be a little too lightheaded to swim. Ultimate luxury.