Jeff Peterson has always liked a challenge. It's the reason why the former Bristol resident once hiked 2,200 miles across the Appalachian Trail from Georgia to Maine. "I had never hiked before and I hated camping. It was right after I had retired and I just wanted to challenge myself mentally and physically," Peterson said. "I swore I would never do anything like that again. It was the dumbest thing I had ever done. And after a few months, I realized I needed a goal to be thinking about, to keep me focused a little bit." So two years ago Peterson went off on his next venture, an 820-mile hike across Spain and Portugal speaking no Spanish. Now, the 63-year-old Ponte Vedra Beach, Fla., resident is heading from the northwest tip to the southeast tip (Anacortes, Wash. to Key West, Fla.) of the country on a bike. He is once again raising money for three charities: the Sun Dial Manor in Bristol, the K9s for Warriors, and the Down Syndrome Program at Boston Children's Hospital. Yo