Having seen it in the flesh, I think it is a Prunus. Leaves have serrated edges which I cannot see in your photos, the leaves are quite thin, not fleshy, and there are occasional spines. Don't think it matters which Prunus. If you think it does, will have to leave one somewhere to flower and fruit. Hard to do when they are in the slashed zone. We have previously recorded P. cerasifera in this area.
abread111 see new close up; I began to tackle yesterday along with privets and mapped with Field Maps; each shrub with multiple stems - not sure whether this is natural growth habit or result of regular slashing....
My suggested identification is a wild guess and is presumably wrong. The tree is wild, part of a rainforest creek, definitely not planted. I'll try to get better photos with another camera. Leaches were a problem last time.