Update (Jan. 8, 9:15 a.m. PT): Due to the popularity of this deal the $580 price is now sold out. Oceanview cabins are $652 per adult with up to two kids sail free. Additional sailings are also available as part of this larger Disney cruise sale.

Glide through the Caribbean for four nights on Disney Cruise Line's Magic -- named a Top Large Ship in the 2011 and 2012 Conde Nast Traveler readers' poll -- for $580 per adult.

Best of all, up to two kids (17 and younger) sail for free, making the effective rate $290 per person for a family of four. This deal saves $600 per family of four off regular prices, and all reservations also receive a $50 onboard credit (per cabin).

The ship departs on April 16 and sails to Cozumel roundtrip from Galveston, Texas, located 50 miles south of Houston. Balcony and oceanview cabins are also discounted.

Ship highlights include: a state-of-the-art, jumbo poolside screen for Disney movie viewing; the only fireworks display at sea; character encounters; and adults-only spaces, including a quiet pool and an elegant restaurant.

This is part of a larger Disney cruise sale that includes four- to eight-night sailings (from Miami or Galveston).

Note: Taxes are an additional $39.99 per person.