Recommend 4 hikes for me in Rocky Mountain National Park, but I need them to be really easy, they can't be more than 3 miles and not more than 400 feet of elevation gain -
Here's a list of 4 easy hikes in Rocky Mountain National Park: 

1. Copeland Falls - This hike is less than a mile long and walks alongside a creek, featuring several waterfalls. There is less than 100 ft of elevation gain and is rated at 1.01 on the difficulty scale.
2. Coyote Valley Trail - A great hike for seeing wildlife such as moose, elk, and beavers, this one-mile trail features the Never Summer mountain range and is wheelchair accessible.
3. Alpine Visitor Center - Although it is one of the highest hikes at Rocky Mountain, it still only ranks 1.02 on the difficulty scale.  It's 0.6 miles long and has a stunning view of the Rockies, as this hike takes you high above the treeline (over 12,000 ft).
4. Sprague Lake Loop - This trail has the easiest difficulty rating of them all, at 0.92.  It offers up great views of the Continental Divide and is a prime place to look at the aspens in the fall.