Where to Level?

[Valparaiso]

Currently 41 Alliance. I cant find a great place to level til 45. Swamp of Sorrows is just a few quests, Feralas sucks butt. Cant find a single quest there. And Dustwallow Marsh is done. I done almost every quest there.

Any advice?

[PeNguiNx]

Level 30-40 Desolace & Feralas
Level 40-50 Felwood

or Level 30-40 Arathi Highlands
Level 40-50 Hinterlands & Western Plaguelands

or Level 30-40 Stranglethorn Vale
Level 40-50 Swamp of Sorrows & Western Plaguelands

Since the server is 1x, you have to go the extra mile and grind w/e mobs/quests you can which may include some extra travel time.

[Jhenna0]

Felwood is more for hordes, has only few quests for alliance.
Arathi Highlands has almost no quests for alliance, has 3 or 4.
Swamp of Sorrows almost no quests either.
Western Plaguelands is 51+ (according to wiki and im pretty sure its not for 40+)

If you can't find quests in Feralas then it means you are looking in the wrong place, Feralas' alliance base is on the northern island, you get there by boat.
Other 40-50 zones are: Tanaris & Hinterlands, switch between those three.
Since you are lvl 41 and haven't done Strangletorn vale yet, then I recomend doing some quests there.
I personaly hate Desolace, horrible landscape.
At around lvl 45+, if you need help to reach 49 (ungoro!!!), then I recomend Searing gorge.
Logout inside an inn or capital city to get 'rested' status and get 200% exp from mobs.