Again this year the National Park Service will offer fee-free days, allowing visitors to check out the nation’s 391 national parks without paying an admission fee, according to a news release.

The first fee-free days are scheduled for April 17-25, National Parks Week 2010. Information on additional fee-free periods will be released later this spring.

Many park partners, including tour operators, hotels, restaurants and gift shops, plan to enhance the fee-free periods by providing discounts and special promotions to sweeten the deal. Fees for activities such as camping, tours, or concessions are not affected by the entrance fee waiver.

There are 147 parks that normally charge entrance fees ranging from $3 to $25, and 244 national parks never charge entrance fees.

For more about national parks, visit www.nps.gov.