Recreation.gov

Government site provides information about federal recreation areas. Search by state, activity, agency, or by map.
http://www.recreation.gov

National Park Trust

Land conservancy dedicated exclusively to America's national system of parks, wildlife, scenic wonders and historic monuments.
http://www.parktrust.org/

National Park Foundation

Purchase the National Parks Pass, plan a trip, read community opinions or learn about volunteer opportunities.
http://www.nationalparks.org/

US-Parks.com

Guide featuring park descriptions and fees, a lodging directory, trip and activities planning information, books and maps.
http://www.us-parks.com/

Public Lands Information Center

Not-for-profit portal affiliated with USDA Forest Service and Bureau of Land Management. Resource for maps, guides, passes, permits, pictures and recreation information for state and federal lands.
http://publiclands.org/

National Park Directory

Information on location, seasons open, area in acres, major attractions and activities.
http://www.cftech.com/BrainBank/OTHERREFERENCE/THEOUTDOORS/NatlParks.html

Personal page by David L. Scott

General introduction to park facilities as well as entrance, camping and lodging fees.
http://www.valdosta.edu/~dlscott/national_parks/parks.html

Mapping the National Parks

Collection documenting the history, cultural aspects and geological formations of areas that eventually became National Parks.
http://memory.loc.gov/ammem/gmdhtml/nphtml/nphome.html

American Park Network

Publisher of visitor guide magazines offers information on trip planning, reservations and family activities online.
http://www.americanparknetwork.com/

National Park Reservations

Offers reservations and information about national parks throughout the U.S. and Canada, including lodging and activities.
http://www.nationalparkreservations.com

Untraveled Road: National Parks

Interactively follow roads and trails of many National Parks online.
http://www.UntraveledRoad.com/USA/Parks.htm

National Parks Gallery

Gallery of pictures of some of America's national parks and monuments.
http://nationalparksgallery.com

A 2-Year Exploration of America's Treasures

A personal journey from east to west through 358 sites documenting their travels through writings and photos.
http://www.usa-c2c.com

National Parks Conservation Association

Resource offers park and wildlife safety, virtual visits, exploration with guides, how to take action and nation involvement.
http://www.npca.org/

Adventure Crew

Source provides pictures, videos, and information regarding many of America's parks, monuments and wilderness areas.
http://www.adventure-crew.com