Just a suggestion. Im sure these have already been mentioned; as they are common for Druids in other games, but the following would add some utility and variety to the Ranger/Druid.
1)Damage Shields – ex: Shield of Thorns.
Few options here:
a)For XX seconds each attacker receives damage
b)Damage shield nullifies XX amount of damage and attackers receive damage
c)etc.
2)Stacking regen – been mentioned many times before, but instead of stacking in duration, stack in intensity
3)Wards – Ward negates XX amount of damage