Join If: You plan to make several visits this year to one of the nation’s biggest amusement parks or any of the 400 parks, monuments, or scenic areas run by the National Park Service.

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National Park Service
Fifty dollars will get you and your family into any site run by the NPS throughout the year. This pass can be a great value, since regular single-visit park admissions are as much as $20 per vehicle per week. The pass doesn't cover or reduce fees for camping, parking, tours, or concessions. For a complete list of park locations, or to purchase an NPS pass, go to www.nps.gov for more information or call 888-467-2757.

Six Flags
Six Flags has amusement parks in 15 states, as well as one in Canada and one in Mexico. Season passes, which cost $40 to $90, must be bought at the park closest to your home but can be used for most Six Flags, with the exception of freestanding water parks. Most parks are open from late spring to early fall. A season pass should pay for itself with three to four visits. Go to www.sixflags.com for more info.

Disneyland/Walt Disney World Disney
Disney offers separate passes for its two U.S. locations, ranging from $209 to $395. Daily park admission usually costs between $53 and $60 per person for people ages 10 and up for one park ($43 to $48 for kids ages three to nine), so if you plan to visit Mickey & Company more than three times in a year, an annual pass may be worth it. Go to www.disney.go.com for more information on parks and prices.