I’m a big fan of Medicine Bow, Wyoming. About a two hour drive from Denver International. If you can stomach some potentially harsh conditions, you could tag that on to the Penn State dual at Wyoming next year, if it happens. Pics below are from first week in July. 30s at day break. For a big summer trip, time it around the rodeo in Cheyenne to get the full western experience. Thats maybe two hours east of Medicine Bow.
Cheynne puts you about four hours from Custer, Black Hills, Rushmore. As many bison (THEY ARE NOT BUFFALO) as you ever want to see. If you post your number I can text you an awesome stampede video. Spearfish, SD is also awesome place. You just go and find a river running through a canyon and make a day of it.
If you went in and out of Denver, easy enough to rack on Rocky Mountain NP. Estes Park is the known side and is overrun. I go in that way because it’s cool to drive across the park on my way to Grand Lake. Grand Lake is super relaxed and it’s easy enough to go back across the park, for me anyway.
Anywhere in Utah is awesome. Moab is the coolest place in the United States, for my money. Red rock out the yin yang. Ride the river, climb, via Ferrata, off road. Not yet commercialized, but it is on its way, unfortunately. If you went there from Denver you cross the high country and all the ski towns, if you have any interest there. Moab will be triple digits hot in the summer. From the other direction, only two hours to Zion from Vegas and another two to Bryce Canyon. Zion woll be overrun with tourists. Throw a dart at a map of southern Utah and you will hit a winner
Carlsbad Caverns to Big Bend is incredible, but you gotta want that one. It gets pretty remote out there. We swam the Rio Grande last year. It’s about a 12 hour drive for me and I would leave tonight if my wife wanted to go again, for some perspective on it. But I love the remoteness. Your phone won’t work, no gas for 100 miles, etc. Carlsbad Caverns was hard to grasp the enormity of the underground space. It seemed never ending. I can post some pictures of these places later.
I’m flying to Redding this summer and going to Redwoods and Lassen Volcanic. First time, Lassen supposed to be relatively uninhabited all year. Can’t wait! United just opened a flight from Denver to Redding, so you could get there in one hop, assuming you are coming from east coast.