Just a few thoughts on the ticks...
I backpack.. a lot.
Every season I soak just about everything in Permethrin. Shoes, socks, shorts, shirts, hats, pants, sun sleeves.. everything except my underwear. Just can't get comfortable with the Permethrin against my nuts..
I soak the stuff and then sun dry. Repeat it about half way through the heavy season.
My hammocks (no tents for me) get sprayed. The hammocks that have bug nets get sprayed.
I use a permethrin cream on exposed skin.
So, pretty much everything is treated.
With all this done, I have still found ticks crawling up the leg of my pants that have been freshly treated. On my shoes. I've found them on my legs that have been treated (nice to have hairy legs.. you can feel the tickling as the bugs travel). Seems like nothing REALLY stops them. Finding them and killing them is an end-of-day camp ritual.
I can tell you first hand, they drop out of trees. Most will do as
@Rickyd describes.. hangout on the ends of long grass waiting for something to pass by close enough to hitch a ride. But I stopped on the trail under some pine trees to check my location.. looking down at my hands holding the map and from directly above a tick lands on the back of left hand. If I didn't see it land on me I would call bullshit.. but I saw it. So there's that..