Every extra ounce counts so keep it light. Here are the must haves: water; bike repair kit with air pressure gauge, tire irons and spare tube; small pump; money, ID and insurance card; cell phone.What to Wear
This is not a fashion show. Safety and comfort come first. Always wear a helmut; bike shorts with gel padding; fingerless gloves; bike jersey—not essential but the back pockets are handy.Check Out Your Bike
Check out your bike to make sure it’s ready to roll. Tires—be sure your tires are properly inflated. Brakes—see that the brake pads, front and rear, are hitting the tire, not the rim. Seat and handlebar posts—be sure they are properly adjusted and securely locked. Chain and gears—lubricate the chain regularly, and run through the gears.Cycling Organizations
League of American Bicyclists : Promotes cycling for fun, fitness and transportation, and works through advocacy and education for a more bicycle-friendly America.
Bikes Belong!  A membership organization founded by bicycle industry leaders with the mission of "putting more people on bikes more often."
Rails-To-Trails Conservancy : Dedicated to creating a nationwide network of public trails from former rail lines and connecting corridors.