The A-Lodge just outside of Boulder is the ultimate adventure home base. Developed in 2015 from an old motel property along a beautiful, babbling creek in the heart of Boulder Canyon, the current owners have added tent campsites, an RV parking area, a youth hostel, on-site cafe with tap room and canned wine, patio with communal fire pit, and an amazing hot tub in a little gazebo.
There are trails on site that connect to the larger Betasso Trail Network, a small slackline park, daily happy hour specials, bottle fill stations, and snacks, drinks, and a few basics available for sale on site. On top of all that, it's a cannabis-friendly campground (though you are asked to keep your puffing and passing to designated smoking areas outside). There's a beautiful bridge surrounded by twinkle lights coating the trees like vines and you fall asleep to the sound of the creek. You're just twenty minutes (if that) outside Boulder, and only an hour from Rocky Mountains National Park/Estes Park and two from Mt. Evans.
Mountain biking and hiking are popular in the area, as well as angling. A-Lodge offers guided expeditions, yoga classes, campervan rentals, etc. and they are very sweet and accommodating hosts. Whatever you're hoping to get into in the area, they'll help you put it together. This place was just as accommodating and comfortable for a solo adventurer like myself as it was for the several families also staying there with small children. Eat up at the continental breakfast included in your stay— there's yogurt, coffee, oatmeal, tea, and a waffle maker.