It is nice to hike with kids, but you must know something about hiking if you want to take a happy, relaxing trip.
Start early, know what to do in a heavy rain and carry sunglasses. Take snacks, toilet paper and a bag with you. Take a whistle(口哨) for kids. You may use it if children run away.
Find a partner. Kids are naturally competitive, and you can use this to your hike. They will try to do better than each other when they go hiking. They also will keep each other interested in something new.
Do something easy. It's good to play easy games. You can say "Does anybody see anything red that matches my shirt?" Kids will be easy and happy to answer this kind of questions.
If you aren't excited, they won't be either. When your kids find something they are interested in, you must show your interest in it, too.