Local, state and national parks offer many different opportunities for hiking. Some are short, easy treks to breathtaking scenery; others are major climbs that test your endurance. Preparing for a big hike can be a fun and healthy family activity, too. Some parks even have trails for those with physical limitations or special needs. Check the Web site of the park you have in mind to learn about don't-miss scenery, special features, the length and challenge rating of trails, and whether or not pets are welcome.