From thread: What's Your Zombie Plan?
...Step 9. Find the tallest climbable tree you can find (not near the bike or jeep). Wear the bag on your back. Wear the harness, rope, shotgun, and ammunition over you shoulders. This will be a lot to carry, but shouldn't be impossible. If it is, get the lady to help. If there is no lady present, leave the rope and harness at the bottom of the drop and come back for it. If you are going up the second time, take the crowbar and the axe with you. If not, wait until the next time you are going up the tree.
Step 10. When at the top of the tree, try to throw the rope across to a nearby tree. Tie a noose and catch it on an upturned branch. Climb the second tree later and secure the rope more. (Over the course of several days you may wish to use as much rope as you can find on your scavenge hunts to build up a network of ropes, so that you may travel through the trees if a necessary (for example if the zombies are climbing your tree, it will buy you some time.))
Step 11. Secure bag onto tree, either with it's straps or with the rope. Secure the harness to the tree. Secure yourself to the harness. (If there is a lady present secure her to you with excess rope). Spend the night up there. Hopefully the outside situation will have calmed down over night. Yes there will still be zombies, but hopefully the panic will have died down by then as paniccy people usually die first.
Day 2.
Step 1. Wake, cover yourself in warpaint. Tell the woman to stay where she is. Express how important it is that she stay there. (You will have already the discussed this the night before).