Use common sense, if something seems dangerous, don't do it. Watch your step as you climb and remember that: If you climb don't look at the sceneries, if you look at the sceneries don't climb!
Also note the high altitude. The park entrance is about 10,000 feet above sea level and the Five Colored Pool is nearly 12,000 feet above sea level. Since the air is thinner, pace yourself as you make the hike up.
lodging
Huanglong is intended to be climbed up and down in a single day so there is no lodging on the mountain.
flora and fauna
There is many types of plants and trees on the mountain, some are rare and may be endangered so take time to enjoy and see it! Animal life is of course existant but the chance of seeing one going up the mountain is very slim excepy you might see a few squirrels.
landscape
Huanglong is a mountain that is relatively easy to climb, and the mountain is covered with trees and plants and also many mineral pools and small water falls.