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*Sixteen luxury hotels in New York have a third-night-free offer when you stay and pay for two consecutive nights. Participating hotels include the Carlyle, the Mandarin Oriental, the Plaza and the St. Regis. Sample rates: A classic room at the Carlyle in mid-July runs $689 per night double, including all fees and taxes; with the deal, the three-night total is $1,378, for a rate of $459 per night. Travel through Sept. 5. Info: www.nycgo.com/thirdnight.

*Tourism Ireland is offering free passes for unlimited train travel across Ireland for visitors 66 and older. Routes through the Republic of Ireland are covered by the Golden Trekker pass; for Northern Ireland, you need a separate pass, the Northern Ireland Golden Trekker Smartcard. For an idea of what you can save, here are sample fares: Dublin to Cork, $46; Galway to Dublin, $20; Belfast to Sligo, $107. The offer is good for travel through December for the Republic of Ireland, through September for Northern Ireland. Apply by calling (800) 742-6762 (have your passport number at hand) at least 48 hours before travel. Info: www.discoverireland.com/us/ireland-plan-your-visit/facts /golden-trekker.

*Loews Miami Beach Hotel has a fourth-night-free deal, plus a $100 food-and-beverage credit, for stays through Sept. 30. A luxury king room that costs $269 per night double comes to $807 for four nights, instead of $1,076. Add $92 in taxes. With the food credit, you save almost $400. Info: (877) 563-9762, www.bit.ly/cXOZFq.

*Two passengers sail free when sharing a stateroom with a paying couple on MSC Cruises' select fall foliage trips through Canada and New England. The voyages run from six to 10 nights and depart from New York and Quebec City. For example, on the Oct. 23 six-night "Maple Leaves and Mansions" cruise from Quebec to New York, rates normally begin at $599 each for the first two passengers and $349 each for the third and fourth passengers, for a total of $1,896. With the deal, the total is $1,198. Add $81 per person in taxes. Book by July 31. (Note: The deal is not listed on MSC's Web site, but you can book it by telephone or through a travel agent.) Info: (877) 665-4655, www.msccruisesusa.com.

*Viking River Cruises is offering a two-for-one fare deal, an $800-per-couple airfare discount and free wine with dinners on its 2011 Grand European Tour cruises. Fares for the 14-night cruises vary by sailing date. For example, with the deal, July and August sailings from Amsterdam to Budapest start at $3,812 per person, including all fees and taxes, vs. the normal rate of $7,399. Daily shore excursions are included. Round-trip air from Washington, ordinarily an additional $1,395 per person, is $995, including taxes (you don't have to purchase the airfare to get the cruise offer). Book and pay by July 31 using promo code EBD. Info: (866) 200-5395, www.vikingrivercruises.com.

*American is having a sale on flights to Rio de Janeiro from several U.S. cities. Round-trip fares from New York's JFK airport start at $772, plus about $100 in taxes. Other airlines are matching. Book by July 28 for travel through July 31. Info: (800) 433-7300, www.aa.com.

*With Gate 1 Travel, save $100 on the cost of European Christmas market river cruise trips departing in late November and throughout December. For example, the regular rate for the Dec. 15 eight-day Christmas Danube River Cruise from Nuremberg, Germany, to Vienna starts at $1,922 per person double and includes air from Washington Dulles to Munich, transportation to Nuremberg, six nights aboard the MS Amadeus Royal, market tours, most meals, unlimited wine with dinner, return air from Vienna to Dulles, and all taxes. To receive $100 off, use promo code PRXM100 when booking. Info: (800) 682-3333, www.gate1travel.com.

Deals sell out and availability is not guaranteed. Restrictions such as blackout dates and advance purchase may apply.