*Hawks Cay Resort on Duck Key, Fla., is offering a Couples Castaway package for stays through March 31. Deal includes a free fourth night (based on weekday rate) and several other freebies, such as a bottle of wine and wineglasses ($50 value), a sunset bike tour ($20; available Tuesdays, Fridays and Saturdays) and a couples' massage course ($50; 11 a.m. Saturdays). Nightly rate starts at $249 Sunday through Thursday and $289 Friday and Saturday, plus $25 nightly resort fee and 12.5 percent taxes. Book by March 15. Info: (877) 484-9342, www.HawksCay.com.
*Silversea has expanded its $1,000 per-cabin (or $500 per-person) shipboard credit promotion. The deal now applies to 38 sailings in 2011; book by June 30. The credit is valid on spa services, shore excursions, premium liquor and wine selections, specialty restaurant fees, Internet cafe charges and onboard shopping. The promo can be combined with other discounts, such as free airfare and fare reductions of up to 60 percent. For example, the 10-day Silver Cloud cruise departing June 15 from Barcelona and sailing to Southampton, England, now starts at $5,118 per person double, with taxes; brochure rate was $12,795. Price includes round-trip air from 22 cities in Canada and the United States. Info: (877) 215-9986, www.silversea.com/specialoffers.
*Norwegian is offering free cabin upgrades on many of its 2011 cruises. Deal applies to dozens of itineraries in Alaska, the Caribbean, the Bahamas and the Mediterranean. Prices and upgrade value vary. For example, a seven-night Alaskan cruise aboard the Norwegian Star that sails round trip from Seattle on June 11 costs $3,642 per couple for a mini-suite with balcony; the upgrade from a balcony cabin is worth $200. Book by March 27. Info: (866) 234-7350, www.ncl.com.
*Receive a free night's stay this spring when booking rooms at special rates at Hawaii's Prince hotels: The Prince Hotel Waikiki and Golf Club (rates from $229 per night), Hapuna Beach Prince Hotel (rates from $289 per night) and Mauna Kea Beach (rates from $500 per night). Deals are for either a fourth night free after three nights' stay or a third night free after two nights' stay. Dates vary, but some extend to June 30. Stays must be consecutive nights. Call (866) PRINCE-6 or visit www.PrinceResortsHawaii.com/FreeNight.
News staff contributed to this column. Restrictions such as blackout dates and advance purchase may apply.