I think one thing that's really useful about tripping and taking other drugs that expand your perception, is the tendency for this kind of substance to make you feel connected to the world outside your limited perception. One of the most problematic elements of depression, is the feelings of isolation and loneliness, so the experience of feeling super-connected to the world outside yourself if only for an hour or so, can having an extreme effect for a really long time. Similarly being out in nature can put you in touch with those kind of feelings. To summarise, go and trip in the woods! Safely of course.