Here are some examples about the importance of the national park.
1: The national park is the place where people can use to keep and protect the rare plants and animals.
2: Visitors love to visit the national park because it's cool, full of amazing things about nature,....( attraction attractions)
3 : The national park is also a place people can go there to see the mini natural world, to relax or to find the ideas for a project.
p/s : That's it. I can't think for more ideas. You can search on the internet for more stuffs.
If there are any mistakes, plz corrected it.