This is not an easy hike.  It is definitely worth the effort.  It is about  5.5 km (3 1/2 miles) each way and it gains elevation steadily.  But it has incredible views, many different areas of topography, and a wonderful teahouse at the top. Wear decent walking shoes (not sandals or high heels) and take a rain jacket and a light fleece jacket as the weather here, as in all of the Rocky Mountains, can change quickly. Water and snacks are also a must. Hiking sticks (also called hiking poles) can help a great deal. 

This is a very popular trail, so you may wish to make an early start (before 10 a.m.) to avoid the busiest time of day.

The hike for one out of shape hiker was about 3 hours up and two back, plus one hour at the top for lunch at the teahouse.