B1 is simple, you take the left or right path way to get over a bridge, then back to the middle and at the end is the teleportpad.
B2:

You take Camp 1,2,9,10,11,12,13,14,15,16. As you can see on the map take the one in front of you at first, then right, right, left, left, straight for the rest of the camps.
B3:

Follow the red line, I found that one the fastest.
B4:

4 ways to get to the centre where medusa's teleporter is. Again, just follow the red line ^^