>>2844111
It's definitely a bad idea to shoot at trees unless they are completely rotten.
If you could drive I'd just recommend buying a portable target but if you want to hike to the place you'd be shooting at then you are pretty much stuck with whatever makeshift target you can make out of things you can fit in a backpack.
Personally I use a few thick layers of cardboard taped up in front of whatever bit of raised earth I can find, though I do it with my lighter 25# bow.
I know other people use mats and rugs as arrow catchers so maybe that could work as well if cut up and layered.