Some random things that you can do outside are go for a walk, star gaze, go hiking, have a picnic, go to amusement park, go to a county fair, ride a horse, go bike riding, plant a garden, start a scavenger hunt, go to a movie, climb a tree or go for a jog.
You could also get a movie projector for your home and set up the back drop outside and lay outside on the grass in your yard or in your outdoor chairs and watch a great movie outside in your yard.