My druid is 6th level, very plain yet terribly effective. Toughness, natural spell and power attack are great. As a part time barbarian, you can use a greatsword no problem, but stay away from metal armor.
You will run out of rages with but a dip, so get the extra rage feat. Plus planar wild shape I think it's called is really quite nice.
If you want to intimidate and use cornugon smash as a large animal, go for it. Just pack a decent intimidate bonus.