[Bear]

I have some quests that I do every day and at Level 45 they give me about 1/2 a level and I earn about 1900 Planarite. They are mostly rift quests of to type. To kill X amount of Rift Creatures and to close 2 Rifts. There are also a few fast daily quests I throw into my routine.
These can easily be done Solo! 

*These are Defiant Quests*

*The Tooltips for the quests show incorrect XP as the rate has been increased GREATLY on Prime Server!*

Freemarch Denegar's Stand
     Hurt Them Back
     A Longer View
Stonefield Granite Falls
     Blinded by Science
     Scared Riftless
     Extra Strength Relief Non-Rift Quest
Scarlet Gorge Scarwood Reach
     Tear Them a New One
     Out of this World
Scarwood Reach Perspice
     The Other Most Dangerous Game
     Wyrd Science
     Bare Knuckled: The Return Non-Rift Quest REPEAT 3 Times per Day!
Iron Pine Peak Chancel of Labors
     Not On Our Watch
     Train the Recruits  Non-Rift Quest
Moonshade Highlands Timbervale AND Reclaimers Hold
     Highlands Incursion
     Highlands Reclamation
Droughtlands Lantern Hook
     Tilting the Odds
     A New Deal

So I do these every day and they really help with level 40 + Leveling along with Planarite farming!

*Tips*
1) To speed things up when a Rift hits stage 3 let the Countdown Timer expire before you complete it and get credit for the Rift and skip the last two stages.

2) Always log off in a place that you will get rested XP. If you run out on main then park it and play an alt for a day or so to build up rested XP BUT do your Daily Quests Every Day!

[Feargasm]

Also, you can pick up your Weekly in your capital city.  For Guardians, it is called:
Frontlines of the Planes

Collect Glowing Puresources from Zone Events that grant experience in any zone.
Collect Glowing Puresources from zone events

I tried finding it in Meridian on Live, but couldn't seem to find it.  It gives 500 Void Stone, and 21.1k xp.

[Bear]

Also, you can pick up your Weekly in your capital city.  For Guardians, it is called:
Frontlines of the Planes

Collect Glowing Puresources from Zone Events that grant experience in any zone.
Collect Glowing Puresources from zone events

I tried finding it in Meridian on Live, but couldn't seem to find it.  It gives 500 Void Stone, and 21.1k xp.

OH! I know this one! 

For Defiant you go into manufactury and into the room to the left, all the way to the back! Shield of the Land