Just a little, quick update. By modifying them very subtly, I have added a way to parkour up to the top of the big trees on the map. If you manage to reach the higher bushes you'll find a chest containing Healing Potions. Don't expect to find a crazy number of potions, or to find the chest on every tree - is just something to make some of the bigger ones more interesting. I personally tested all of them myself and I can assure that there is at least one legit way to the top. You can use the grapple if you want, as well, but is not mandatory in order to reach the tops. Enjoy!