All you need in life is a strap and some homies.
There's a gun over the cliff at the edge of the forest. The platforming falls short, especially when climbing upwards, because you may find yourself running off platforms. I should have implemented ledge protection.
After that, bring the gun back home and it should be more clear what to do.
I didn't know about the rocks. I tried patching some clips and bad geometry yesterday, but there were too many :'( Hopefully this advice helps!