The Pierre Shale formation was deposited during the Paleogene and Cretaceous periods about 70 million years ago. The region was covered by a deep sea—the Cretaceous Western Interior Seaway—which deposited massive amounts of shale on the seabed. Both the thick stratum of shale and embedded marine life fossils—including ammonites and skeletons of fish and such marine reptiles as mosasaurs, plesiosaurs, and extinct species of sea turtles, along with rare dinosaur and bird remains—were created during this time period. The area now known as Colorado was eventually transformed from being at the bottom of an ocean to dry land again, giving yield to another fossiliferous rock layer known as the Denver Formation.[58]
Keystone is the ultimate year-round outdoor playground. Families will discover a wealth of things to do to keep the kids, and themselves happy, with everything from a Kidtopia Play Park, Keystone Science School Day Camps and the summer snow tubing hill to stand up paddle boarding and boating on the lake, miniature golf, GPS Geo-Cache Adventures and dinner wagon rides. Then there are the festivals, like the Model Boat Regata, the Snake River Festival, and Cirque D’Wheels. If you stay at Keystone Resort, the Kidtopia Children’s Theatre hosted in the Quaking Aspen Amphitheatre is free every Friday.
No trip to Estes Park would be complete without a leisurely drive along the Trail Ridge Road at Rocky Mountain National Park, with its winding scenic views of craggy peaks. Park your vehicle and take a hike through one of the many pine-scented trails bordered by forests and tundra. Keep an eye out for elk and other wildlife as you go! Roosevelt National Forest is another wilderness area worth exploring, Meanwhile, you can enjoy the breathtaking views over the valley on the Estes Park Aerial Tramway, which connects the town to the summit of Prospect Mountain. Down Estes Park has lots of options for one-off shopping and dining, whether you feel like chowing down on a handmade pizza or a juicy elk burger. Afterward, quench your thirst with a pint of Colorado craft beer at one of Estes' local breweries.
If you and your valentine enjoy winter adventures, a mountain escape is perfect for a weekend away! Opt for your favorite resort or venture somewhere new to enjoy outdoor winter activities during the day, like snowshoeing, skiing and skating, and relax at night with drinks and hot tubbing. Make the weekend extra special with a horse-drawn carriage ride to dinner. Find a Colorado cabin perfect for any getaway here .
Perched on the western edge of the Rocky Mountain National Park, Grand Lake is the perfect weekend destination for outdoor enthusiasts and families traveling with kids. Providing easy access to hiking, Grand Lake is home to wildlife watching and winter activities such skiing and snowshoeing, where visitors are spoiled for choice in how they spend their days. A picturesque marina offers boat rentals and paddle boards, while there are sandy spots that are perfect for beach-related activities. Those who want to explore the area should drive along the scenic Trail Ridge Road and venture into the park to the nearby town of Estes Park on its other side.
You have never seen a Y like this!  We offer over 200 family cabins ranging from 2-4 bdrms, which can hold up to 10 people.  Be close to the main campus & activities or far from it all, in secluded woods.  Our cabins are fully furnished and include eating & cooking utensils, plus linens & towels.  Many free activities are available - we offer more activities onsite than any other area property!  YMCA of the Rockies - Estes Park Center Details
The Experience: If Aspen isn't quite your mountain town scene, head to Vail instead. It's equally as idyllic (it was modeled after European mountain resorts), pedestrian-friendly, and lovely, but the town itself is more of a square in a village with a small collection of boutiques and restaurants for visitors. Ride up and down the gondolas for mountain views in every direction and ski the unique back bowls. It's also closer to Denver, making it easier to get to and, therefore, a little more crowded during peak seasons.
Explore the nearby great outdoors at the Horsetooth Mountain Open Space or get your adrenaline pumping by rafting on Cache La Poudre River with the Mountain Whitewater Descents Company. Visit Global Village Museum of Arts and Cultures to learn about folk art from all over the world. Take the kids to the Farm at Lee Martinez Park to learn about the farm life and play with baby farm animals. 
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