I know I already created a thread for more visual differences between the playable races tribes but I just can't help myself. XD
As the title says, I suggest giving each of the Playable Races' tribes their own quests similar to the Beast-Tribe Quest.
Each quest could help shape the different cultures of the playable races.
For players who aren't that race/tribe: The quests could provide one or two race-exclusive hair styles and maybe versions of the race's starting gear that any race can wear.
For players who are that race/tribe: The quests could provide more unique outfits and gear that only that race can wear and maybe even more unique hairstyles and face paint for that race.