Outland Explorer

Use the Paste Addon and set all the zones up at once.

/WAY hellfire pen 69 71 Zeth'Gor
/WAY hellfire pen 27 61 Falcon Watch
/WAY hellfire pen 55 63 Honor Hold
/WAY hellfire pen 42 31 Pools of Aggonar
/WAY hellfire pen 22 40 Temple of Telhamat
/WAY hellfire pen 56 37 Thrallmar
/WAY hellfire pen 14 42 Fallen Sky Ridge
/WAY hellfire pen 54 83 Expedition Armory
/WAY hellfire pen 49 50 Hellfire Citadel
/WAY hellfire pen 32 28 Mag'har Post
/WAY hellfire pen 15 60 Ruins of Sha'naar
/WAY hellfire pen 69 53 The Legion Front
/WAY hellfire pen 63 18 Throne of Kil'jaeden
/WAY hellfire pen 29 74 Den of Haal'esh
/WAY hellfire pen 76 63 Void Ridge
/WAY hellfire pen 64 31 Forge Camp Mageddon
/WAY hellfire pen 45 83 Warp Fields
/WAY hellfire pen 76 71 Void Ridge

/way terokkar 41 22 Cenarion Thicket
/way terokkar 38 35 Grangol'var Village
/way terokkar 51 29 Tuurem
/way terokkar 60 40 Raastok Glade
/way terokkar 54 20 Razorthorn Shelf
/way terokkar 33 69 Auchenai Grounds
/way terokkar 34 52 Refugee Caravan
/way terokkar 31 53 Shadow Tomb
/way terokkar 24 59 Veil Rhaze
/way terokkar 66 71 Skettis
/way terokkar 55 54 Allerian Stronghold
/way terokkar 68 36 Firewing Point
/way terokkar 50 48 Stonebreaker Hold
/way terokkar 35 30 Shattrath City
/way terokkar 29 12 The Barrier Hills
/way terokkar 64 52 Bonechewer Ruins
/way terokkar 42 52 Carrion Hill
/way terokkar 36 63 Ring of Observance
/way terokkar 43 76 Derelict Caravan
/way terokkar 50 66 Writhing Mound
/way terokkar 20 63 Bleeding Hollow Ruins

/way Blade's edge 52 12 Bash'ir Landing
/way Blade's edge 40 53 Bladespire Hold
/way Blade's edge 46 77 Bloodmaul Outpost
/way Blade's edge 53 43 Circle of Blood
/way Blade's edge 73 41 Forge Camp: Anger
/way Blade's edge 40 40 Forge Camp: Wrath
/way Blade's edge 65 24 Gruul's Lair
/way Blade's edge 76.4 65.9 Mok'Nathal Village
/way Blade's edge 65 53 Razor Ridge
/way Blade's edge 72 23 Skald
/way Blade's edge 64 14 Crystal Spine
/way Blade's edge 35 76 Veil Lashh
/way Blade's edge 71 61 Vekhaar Stand
/way Blade's edge 70 42 Bladed Gulch
/way Blade's edge 55 27 Bloodmaul Camp
/way Blade's edge 77 24 Broken Wilds
/way Blade's edge 64 67 Death's Door
/way Blade's edge 28 81 Forge Camp: Terror
/way Blade's edge 39 20 Grishnath
/way Blade's edge 49 70 Jagged Ridge
/way Blade's edge 31 28 Raven's Wood
/way Blade's edge 62 34 Ruuan Weald
/way Blade's edge 37 64 Sylvanaar
/way Blade's edge 52 56 Thunderlord Stronghold
/way Blade's edge 64 31 Veil Ruuan
/way Blade's edge 30 64 Vortex Pinnacle
/way Blade's edge 61.6 39.6 Evergrove FP

/way shadowmoon valley:outland 45.5 28.3 Coilskar Point
/way shadowmoon valley:outland 46.1 68.9 Eclipse Point
/way shadowmoon valley:outland 23.3 38.2 Legion Hold
/way shadowmoon valley:outland 70.5 85.4 Netherwing Ledge
/way shadowmoon valley:outland 29.2 28.7 Shadowmoon Village
/way shadowmoon valley:outland 73 43.8 The Black Temple
/way shadowmoon valley:outland 40.4 39.2 The Deathforge
/way shadowmoon valley:outland 50 40.5 The Hand of Gul'dan
/way shadowmoon valley:outland 60.1 48.7 Warden's Cage
/way shadowmoon valley:outland 35.8 58 Wildhammer Stronghold
/way shadowmoon valley:outland 61.7 29.1 Altar of Sha'tar
/way shadowmoon valley:outland 29.5 55.3 Illidari Point
/way shadowmoon valley:outland 64.2 57.6 Netherwing Fields

/way Zangarmarsh 83 82 Umbrafen Village
/way Zangarmarsh 81 38 The Dead Mire
/way Zangarmarsh 79 64 Cenarion Refuge
/way Zangarmarsh 70 80 Darkcrest Shore
/way Zangarmarsh 68 48 Telredor
/way Zangarmarsh 61 41 Bloodscale Grounds
/way Zangarmarsh 58 62 The Lagoon
/way Zangarmarsh 47 53 Twin Spire Ruins
/way Zangarmarsh 46 63 Feralfen Village
/way Zangarmarsh 42 30 Orebor Harborage
/way Zangarmarsh 31 50 Zabra'jin
/way Zangarmarsh 29 61 Quagg Ridge
/way Zangarmarsh 29 33 Hewn Bog
/way Zangarmarsh 22 40 Marshlight Lake
/way Zangarmarsh 18 50 Sporeggar
/way Zangarmarsh 18 7 Ango'rosh Stronghold
/way Zangarmarsh 17 23 Ango'rosh Grounds
/way Zangarmarsh 14 62 The Spawning Glen
/way Zangarmarsh 84.7 55.1 Swamprat Post FP

/way Nagrand:outland 19.1 51.5 Forge Camp: Fear
/way Nagrand:outland 56 36.3 Garadar
/way Nagrand:outland 42.7 44 Halaa
/way Nagrand:outland 70 81.5 Kil'sorrow Fortress
/way Nagrand:outland 46.7 19.4 Laughing Skull Ruins
/way Nagrand:outland 36 71.4 Spirit Fields
/way Nagrand:outland 31.6 43.1 Sunspring Post
/way Nagrand:outland 53.7 70.6 Telaar
/way Nagrand:outland 65.9 56.1 The Ring of Trials
/way Nagrand:outland 60.2 23.1 Throne of the Elements
/way Nagrand:outland 27 21.1 Warmaul Hill
/way Nagrand:outland 74.4 66.9 Burning Blade Ruins
/way Nagrand:outland 62 63.8 Clan Watch
/way Nagrand:outland 24.6 35.9 Forge Camp: Hate
/way Nagrand:outland 49.4 55.5 Southwind Cleft
/way Nagrand:outland 8.6 43.1 The Twilight Ridge
/way Nagrand:outland 72.6 36.6 Windyreed Pass
/way Nagrand:outland 72.7 52.6 Windyreed Village
/way Nagrand:outland 33.4 15.6 Zangar Ridge Kenshyneus

/way netherstorm 33 65 Area 52
/way netherstorm 22 70 Manaforge B'naar
/way netherstorm 48 84 Manaforge Coruu
/way netherstorm 59 67 Manaforge Duro
/way netherstorm 26 38 Manaforge Ara
/way netherstorm 62 39 Manaforge Ultris
/way netherstorm 54 25 Ruins of Farahlon
/way netherstorm 71 65 Tempest Keep
/way netherstorm 31 76 The Heap
/way netherstorm 40 75 Arklon Ruins
/way netherstorm 72 40 Celestial Ridge
/way netherstorm 56 85 Kirin'Var Village
/way netherstorm 32 56 Ruins of Enkaat
/way netherstorm 56 78 Sunfury Hold
/way netherstorm 44 36 The Stormspire
/way netherstorm 22 56 Gyro-Plank Bridge
/way netherstorm 45 13 Eco-Dome Farfield
/way netherstorm 55 42 Ethereum Staging Grounds
/way netherstorm 29 15 Socrethar's Seat
/way netherstorm 37 25 Forge Base: Oblivion
/way netherstorm 45 54 Eco-Dome Midrealm
/way netherstorm 49 18 Netherstone
/way netherstorm 65.1 66.8 Cosmowrench FP
/cway

Note that you need to have a flying mount/flight form in order to explore all of outland, in fact Zangarmarsh is the only zone for which you don't need to fly.

I find that if you're high up enough, you can fly over enemy towns without getting the Guard's Mark. I tested this on Telaar and Allerian Stronghold - I only got the mark when I flew low.