Spirit Woods
Required:
Gliding: Recommended, Most players should have it.
Optional (Helpful):
Portal Skills: Mesmer's, Scourges and thieves can use these for faster movement between Rifts.
Stability skills: Healers should have these but extra wont hurt.
Mobility Skills: for faster movement between Rifts.
Useful Links:
Guild Wars 2 Wiki Rewards (External).