This is a pretty easy trail accessed from the Glacier Gorge Trailhead with only a 160 ft elevation gain. You'll hike for 0.9 miles one way alongside Glacier Creek, through a forest. After crossing several bridges over the creek you'll be at the rushing waters of Alberta Falls.
Enter Rocky Mountain National Park from the main entrance at Estes Park. Go past the Beaver Meadows Visitor Center and turn left onto Bear Lake Road. Follow this road until you come to Glacier Gorge Trailhead on the left hand side.
http://www.tripleblaze.com/trail.php?c=3&i=3150