Conversation so far:
when was the grand canyon national park established
Grand Canyon was officially designated a national park on February 26, 1919
where is the grand canyon national park
Grand Canyon National Park is located in northwestern Arizona.
what can i do at the grand canyon national park
One of the best ways to admire the Grand Canyon is on a hiking tour that takes you to the bottom. Rafting the Colorado River is another option.

Question: what are some good hiking trails
Self-contained rewrite: what are some good hiking trails for the hiking tour at the grand canyon national park