Definatly woodworking. Scavange, for me, has only found items usful to my job, arrowwood lumber ect...
I try to have wind crystals on me whenever i can. Who knows when you might get hit with an unexpected lack of arrows after a fight. You would be useless. As the old FFXI saying goes, not old but hey, 'A badly equped ranger is the worst job in the game.'.
Arrows are the lifeblood of a bow weilding ranger. Woodworking is something all RNG's should be working on.