IC cougars are the best, exp is crazy! Then dire wolves around the rings/near the EW bridge. Charm and fear-kite. You don't necessarily have to break charm every time (you can just chainkill forever and it's just as good) but the cougars in that spot are neverending so you can if you want. As a wood elf druid, I am dubious to them without wolf form, but they DO social. It's just easy to med. Watch out for the occasional wandering shadow guardian.
Another place to bridge the gap is OT. With fear kiting you can take on much higher level stuff than others. They really start greening out at low forties right by the SF ramp. By then you can hit CoM (ehhh, if you want) or EJ (more animal charming!).
OR, if you want to stay in Velious, go to EW and find the walruses near the Kael entrance. Similar to the IC cougars, there are lots of them and you can charm/fear-kite. These are KoS to you no matter what, so be careful with adds. They aren't QUITE as plentiful and the spawn time isn't as fast, but they also have a lot more HP and they're mean. It's a big open area full of walruses, can't miss it. For extra bad-ass points, charm a snow griffin and murder them all. There are lots of other animals in EW as well.
Walruses would take you to mid forties, EJ is pretty decent til about 50 (though not exactly the most efficient way of doing it). You can quad-kite wyverns in CS starting around 46 (especially if you have a lumi staff), but there's always a lot of competition for those and you get to AFK for 15 minutes after every quad or so.
If you're into doing weird stuff that isn't your standard quad-kiting or animal-charming, you can go to CS, charm a shark, and aggro-kite wyverns.
[You must be logged in to view images. Log in or Register.] Use ensnare and flame lick to keep aggro locked down.