Hearing educators say that field trips are a waste is as painful as hearing them say that recess is a waste. Yes, I've personally heard derogatory remarks about both. Get moving and get into the out-of-doors!
Walking along a river, just where it flows into a lake, we found these sticks with beaver teeth marks. I'm not sure how close the beavers are to this spot, but perhaps we will find out on a future visit.