Riding in the Georgia Mountains is nice. Of all things, take some allergy medication because in the spring, the bees come out in full force.
I got stung in the face in Suches and had to climb Wolfpen, descend Wolfpen (my face blew up like a water baloon...it kept expanding) and then I had to climb Neels and descend it to get to my car at the rockpile.
At the top of Neels, I got some emergency medication from the folks at the store (nice folks) and was told to be extremely careful descending Neels. I almost fell asleep on the descent but thankfully, my handling skills and will to stay awake helped.
After that, I have vowed to take some allergy medication after that incident. It was extremely scary.
As for the humidity, just drink lots of water.