[@Kibaro]

Shield and Sling might work, but not with a heavy shield.  There's one main reason - you need two hands to load a sling, and the hand holding a heavy shield cannot be used for anything else.  A light shield might work, depending on our GM, as you can hold items with that shield hand, but not use items otherwise.  A buckler would work, but since you're a druid, no metal armor, so no-go there.

Side note: always wanted to try a shield & bomb alchemist...

Vos is very right about druids - they're a full caster, which means they focus on the spells usually.  Once you get Wild Shape, well, that's when the dreaded CODzilla, aka Cleric Or Druid-zilla, strikes.  Especially when built right, although Pathfinder has curbed the worst of it compared to 3.5.

Anyhow, I've been told by my old power-gamer buddies, from whom I have learned much, that for druids, [url=http://www.d20pfsrd.com/magic/all-spells/s/shillelagh]Shillelagh[/url] (which I believe is pronounced 'She-la-li', but I could be totally wrong) is the key 1st level spell for melee druids, or at least that was the case back in 3.5.  Otherwise, I'd say Entangle is a good stand-by, and never ever dismiss the power of Summon Nature's Ally.