I think druid should use as a weapon a staff, a staff with tank stats, dps stats and healer stats depending on the spec. And I think druid should be able to wear a leather or cloth armor.
Maybe a tank druid should be able to use a one handed mace with a shield.
To complement the idea of the wood armor, maybe would be nice to see wood armor but used as a leather armor or a leather armor with some wood attached to it, something esthetical.