Nature Sense Walk:
Pick a park or street in your neighborhood and go on a 15-minute nature sense walk. Choose one of the senses and set the goal of noticing as much as you can with that one sense. So, for example, if you choose sound, notice the different chirps of the various birds in your neighborhood, notice the sound that leaves make as you step on them, notice the scraping sound of squirrels' nails as they climb up the bark of the tree, etc.