1. List all the trees in your neighborhood. Our page on backyard trees can help. You may also want to look at our pages on twigs and tree bark. Tree identification books can be reviewed here.

2. Find a spider web, maybe in your basement or in the garden, among the shrubs or among some weeds, and see if the spider is there. Is the web an orb web, sheet web, or some other kind? Check out our Spiders Page and our Spider Silk Page.

3. Put out a birdbath for birds and other critters. It doesn't have to be a real birdbath, but could be something like a turned-upside garbage can lid. The water should be no deeper than an inch. Keep a list of the species who visit.

4. Find the star-shaped pith in an oak twig, as shown on our Woody Twig Page.

5. Go for Naturalist Jim's Bug-Eaten Leaf Awards.

6. Start a rock collection. Our rock section can get you oriented..

7. In the night sky, learn these constellations: The Big Dipper (Ursa Major), The Little Dipper (Ursa Minor), Leo the Lion, Boötes the Herdsman, Hercules, Corona Borealis, and Draco the Dragon. One book to help you is The Sky Observer's Guide: A Handbook for Amateur Astronomers

8. If you see a bird collecting worms or other food for nestlings, watch where the food is taken, locate the nest, and watch it until the nestlings leave (Don't get too close or you'll upset the family.) Check out our birdnest page.

9. At night and with a flashlight, sneak up on a stridulating cricket and watch it sing.

10. Find a lichen, as described on our Lichen Page, and figure out whether it is crustose, foliose or fruticose.

See more at below source...

SOURCE: http://www.backyardnature.net/101/summer.htm