- National Park Service: Official site for U.S. national parks, including maps, guides, and activities.
- Recreation.gov: Plan and book visits to national parks, campsites, and outdoor activities.
- National Park Foundation: Learn about and support the U.S. national park system.
- AllTrails: Discover popular hiking trails, biking routes, and nature paths across the U.S.
- Griffith Park and Observatory: Explore one of the largest urban parks in the U.S. with hiking trails and stunning views.
- Santa Monica Mountains National Recreation Area: Perfect for hiking, mountain biking, and picnicking near Los Angeles.
- Hiking in Los Angeles: Comprehensive guide to the best hiking spots in and around LA.
- Huntington Botanical Gardens: Discover beautiful gardens and natural landscapes in Pasadena.
- Audubon Society: Birdwatching and wildlife conservation resources for nature enthusiasts.
- Defenders of Wildlife: Learn about wildlife protection and conservation efforts across the U.S.
- California Department of Fish and Wildlife: Information on California's wildlife, parks, and conservation areas.
- TreePeople: Join community-driven efforts to plant and maintain trees in urban areas like Los Angeles.
- Kampgrounds of America (KOA): Find camping sites and outdoor adventures throughout the U.S.
- Hipcamp: Unique camping experiences, including RV sites, cabins, and glamping spots.
- Campendium: Reviews and guides for RV parks and campgrounds in the U.S.
- Outdoor Project: Inspiration and tips for outdoor adventures, camping, and nature trips.