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In the age when even books are being downloaded, it is actually a treat to be able to hold a book in your hands, read it and turn the pages. If technology is making books collectible, then that fact is celebrated every day at Green Apple Books. This extensive retailer and online store will not only have your purchases delivered to your door, they will also buy back your old books and give you credit for them on your purchases. There are always special events going on in the store like readings and book signings, so check the website regularly. Also, while you're online or in the store, pick up a cool Green Apple Books t-shirt or bookbag.

The California Academy of Sciences is located in Golden Gate Park and offers the whole family a chance to learn about science in a new and entertaining way. Among the many popular exhibits and attractions are those focused on various types of fish and other aquatic life, the rain forests of the world, and the newly added roof garden. The spirit of scientific discovery is very much alive here, and that pursuit of knowledge will no doubt inspire your kids to not only ask more questions, but find the answers in this highly regarded facility.

No trip to San Francisco is complete without a visit to Fisherman's Wharf. This highly popular attraction is truly a requisite stop as it seamlessly combines the area's unmistakable natural beauty, commercial prowess, and maritime heritage all in one place. You'll want to save a whole afternoon to take it all in, as you will be struck by the impressive selection of one-of-a-kind shops, unforgettable lookout points and excellent restaurants. And speaking of restaurants, you can't visit Fisherman's Wharf without sampling such tasty delicacies as Dungeness crab and clam chowder.

Cycling is considered a legitimate way to get around San Francisco, and the San Francisco Bicycle Coalition does its best to make sure that safety is everyone's first priority. Several of the best bike trails in the city are posted, along with detailed reviews, on their website.