One of my favorite local trials in Northern Colorado is the Arthur's Rock Trail in Lory State Park.
Its probably a favorite for all the peeps who live in this area.
Yesterday I hiked with it a friend who's first time hiking the trail was the yesterday.
I'm always amazed at the awesome views up on the summit of Arthur's Rock.
It's considered a day hike, with frequent breaks and staying up on the summit for a lunch it can take ya about 4 hours or so.
For me its a slow and steady climb up, and a quick descend down.
Lots opportunities to see various wildlife(lizards, snakes, birds, deer, eagles, hawks, chipmunks, etc.)
I love this trail because its a great work out to about 7,000 feet and its just really peaceful to walk around up on the summit and find a spot to sit down and just chill out and enjoy life .
Make sure you back your proper gear when you hike this trail, the weather can turn quickly here in Colorado so having a gortex jacket/pants is must (also suggested is gloves, sun glasses, and boots), as well as a nice warm layer too.
Water is not a good source on this trail, so you must pack in your water too. Remember hydration is very important.
Enjoy your outside adventures and be safe out there.