1. /r/CampingAndHiking <-For multi-day-trip hikers and campers.
2. /r/Hiking
3. /r/WildernessBackpacking
4. /r/Alpinism
5. /r/Mountaineering
6. /r/Canyoneering
7. /r/SearchAndRescue
8. /r/Canoecamping
9. /r/Trailguides
10. /r/BackpackingDogs
11. /r/Backpacking ← For the international or urban traveler who has supplies on their back.
12. /r/Packgoats

Vehicle or RV Camping Subreddits

1. /r/MotoCamping ← Motorcycle Camping
2. /r/Overlanding ← Vehicle camping in remote places
3. /r/TeardropTrailers
4. /r/TruckCampers
5. /r/Adventuremobile
6. /r/VanLife
7. /r/Vandwellers
8. /r/GoRVing

Gear and Food:

1. /r/Hammocks
2. /r/Hammockcamping
3. /r/TrailMeals
4. /r/MYOG ← Make Your Own Gear
5. /r/CampingGear ← Camping Equipment
6. /r/OutdoorsGear/
7. /r/GearTrade ← Trade for Gear
8. /r/ULgeartrade ← Ultralight Gear Trade
9. /r/Flashlight
10. /r/Axesaw ← Hilariously Ineffective Camping Gear
11. /r/GoPro
12. /r/MilitaryGear
13. /r/WorkBoots
14. /r/First_Aid
15. /r/FirstAid
16. /r/WildernessMedicine/

Outdoors Activity Subreddits

1. /r/Climbing
2. /r/Slackline ← Core and Balance training, balancing on webbing.
3. /r/Kayaking ← Kayaking
4. /r/Whitewater
5. /r/Canoeing
6. /r/Caving
7. /r/Outdoors ← General "Outdoors"
8. /r/Shoestring ← Travelers on shoestring budgets
9. /r/ParkRangers
   
10. /r/Adrenaline ← Mostly Videos of high-adrenaline sports
11. /r/trailguides ← Guides to trails
12. /r/Survival
13. /r/Snowshoeing
14. /r/AnimalTracking

Destination Subreddits

1. /r/Adirondacks ← Adirondack state park in NY
2. /r/Algonquinpark ← Algonquin Provincial Park, Canada
3. /r/AppalachianTrail ← East Coast U.S.
4. /r/AZCamping ← Arizona Camping
5. /r/BigBendTX ← Big Bend NP, Texas
6. /r/CarolinaCamping ← North & South Carolina
   
7. /r/CatSkills ← Catskill State Park, NY
8. /r/Coloradohikers/ ← Colorado Hikers
   
9. /r/CampAndHikeFlorida ← Florida
   
10. /r/GrandCanyon ← in Arizona
    
11. /r/GeorgiaCampAndHike ← Georgia
12. /r/IsleRoyale ← Isle Royale National Park
    
13. /r/JMT ← John Muir Trail, CA
14. /r/JoshuaTree ← Joshua Tree NP, CA
15. /r/BackcountryMichigan ← Michigan
16. /r/CampAndHikeMichigan ← Michigan
17. /r/Ulmidwest ← Midwest Ultralight
18. /r/MinnesotaCamping ← Minnesota
    
19. /r/MOutdoors/ ← Missouri Camping
20. /r/Glacier ← NP, Montana
21. /r/NCTrails/ ← North Carolina
    
22. /r/NorCalHiking/ ← Northern California
23. /r/OhioHiking/ ← Ohio
    
24. /r/OhioCamping ← Ohio
    
25. /r/PacificCrestTrail ← Pacific Crest Trail
26. /r/PNWhiking/ ← Pacific Northwest
27. /r/PAWilds ← Pennsylvania Wilds
28. /r/OutdoorScotland ← Scotland
29. /r/SoCalHiking ← Southern California
    
30. /r/TXoutdoors/ ← Texas
31. /r/UKhiking ← United Kingdom
32. /r/VancouverHiking/ ← Vancouver
    
33. /r/Virginia_Hiking/ ← Virginia
    
34. /r/WAOutdoors/ ← Washington State
    
35. /r/WMNF ← White Mountains of NH
36. /r/Yellowstone ← Yellowstone NP
37. /r/Yosemite ← Yosemite NP in California
38. /r/Longtrail ← Vermont
39. /r/GuessThatSpot ← Guess where?
    
40. /r/NationalPark ← U.S.