I've tagged this 30dayswild even though it's urban. After a really hot day (my car said 101, but I think it was exaggerating) I went and walked along the river at dusk. There were all sorts of people enjoying the cool breeze off the river.
Urban counts in 30 Days Wild too - it's just about getting outdoors and enjoying whatever nature there is, even in cities, and a walk at dusk beside a river is a lovely bit of time outdoors :)