Tour Operators:

Elderhostel
educational travel, specializing in trips for elders

Walking the World
walking trips for 50+

Grandtravel
upscale trips for grandparents and grandkids

Sierra Club Outings
annual Just for Grandparents and Grandkids

Great Camp Sagamore
July and August "Grands Camps"

Saga Holidays
sends over 250,000 senior citizens on vacation each year

Grand Circle Travel
oldest U.S travel operator for seniors only

YMT Vacations

Gadabout Tours

Hotels:

Loews Hotels
Eighteen of the chain's hotels put up grandparents and grandchildren in suites or adjoining rooms at 20 to 50 percent off standard rates

Candlewood Suites
Grandparents who bring a grandchild (or simply flash a photo of one) when checking in for the first time, or during one of 11 major holidays, get a second night free.

Hyatt Hotels
Seniors save up to 50 percent at participating hotels in the US and Canada.

Discounts:

U.S. National Park Service
Golden Passport for seniors for free entry, 50 percent discount on some park services.

AARP
15-30% discounts on lodgings and transportation.

Over the Hill Gang International
ski club for seniors