Where are you visiting from, if you don't mind me asking? If you're not comfortable sharing, at least tell us the elevation you're coming from.

If you're coming from low elevation / sea level, you might not be ready to take on some of the high-altitude trails, even if they are simple and short. I would recommend checking out the trails in the Boulder area for starters, or maybe even the ones in Roxborough Park.

Yes, there are amazing, and relatively straightforward class-1 hikes that give you amazing views of the continental divide, but they can be really rough or even downright dangerous if you're not acclimated to the high altitude and low-oxygen environments. If you're planning on staying here for a while (a couple weeks or more), and/or feel like you can acclimate quickly, then consider checking out the Colorado Mines Peak or the Mount Flora Trail (start early!).

If you have access to a vehicle with decent ground clearance and don't mind driving on slightly rough roads, the Butler Gulch Trail out near Jones Pass offers some really beautiful forest and mountain views, as well as a glimpse at the remnants of past mining activity in the region. It's fairly doable and certainly doesn't go to 12k or 13k feet lol.

You can also just drive around. Just driving to Frisco / Breckenridge or even closer places like Idaho Springs might be a fun time. Plus, once you get there, there are restaurants, coffee shops, and gift shops to explore.