I love going on acid/shroom walks. One time, on acid, my friend was like, "We're going to smoke until we can't walk - and then we're going to go on a walk"
so we sat down and smoked an ounce (4 people) through blunts and bongs, i think one or two spliffs
and we went on a walk. it was amazing
also, Ive never done more than 5 grams but my same friend had trouble walking, speaking english (he was speaking shroom.. you know, making noises to try to express the intensity of what he was going through) and that was from 8 gs plus we smoked salvia at the beginning of our trip