Here are a few of the various landscape shots I was able to get while on our fishing/road trip to North Dakota....so much fun and a freezer full of walleye ... so very successful fishing trip!

We drove from Columbia Falls MT to Lewistown MT and stayed for the night, then made it to Ft Peck reservoir for a week or so, then drove to Lake Sakakawea for a week or so. Did some traveling around North Dakota and then stopped at Tiber Reservoir for a couple of days.

Fun adventure! Lots of photo's to go thru but here is a start.

how much time do you have? What are you driving? Just looking at a Rand McNally Road Atlas you could make a nice loop going thru Denver, RMNP, west to Dinosaur Natl.Mon., then up thru the Tetons, Yellowstone, to Glacier. Return via Portland to the Oregon coast, then south along the coast, inland to Crater Lake, down along the Sierras to Reno and Lake Tahoe, east on US 50 to Lehman Cave, Great Basin NP, to Bryce Canyon NP, then south to GCNP North Rim. Then thru Monument Valley to Canyonlands and Arches, east to Mesa Verde NP, Taos, Santa Fe, White Sands NP, Carlsbad Caverns NP, then home. So many nice places you should see; I've been to all except Taos, White Sands, and Carlsbad, and all are worth the time it takes to visit. Shouldn't take more than a couple months and $10k for gasoline.

Columbia River GorgeYou do not say what month you are traveling. There area a series of three waterfalls near Multomah Falls; all situated along the Historic Columbia River Highway which parallels i-84/US-30 right next to the Columbia River.

From West to East the are Bridal Veil Falls, Multomah Falls, and Horsetail Falls. Multomah Falls has a parking lot accessible directly from I-84 however you cannot get (to my knowledge) from this parking lot to the old highway.
The old highway will not accommodate a wide RV or a long trailer and it gets VERY narrow in spots.

Also during the summer months, Multomah Falls is jam packed ( we visited in March 2022) and reservations may be needed. The other two falls had far less traffic.

The Historic Columbia River Highway is a 7-8 mile long stretch with entry and exit points to I-84 at both ends. Multomah Falls is located ~30 miles East of Portland.

Other sites:
Dinosaur National Monument: This has a wonderful little office by the parking lot what has a stupendous and little known follis display. Sometimes a range will be working on newly found fossils in the central room.

Yellowstone Nat'l Park: A gem with something for everyone. My favorite location is Mammoth Hot Springs and the
Travertine Falls. Light is best just before sunrise or else in the latter part of the afternoon and evening when the sun is not directly hitting the white and variegated calcium carbonate. This is a living area and it changes every year as springs dry up and new springs open up. Color is from mineral deposition and some mosses. Of course Yellowstone can be busy but the hot springs are far from Old Faithful. Gardiner, MT is nearly with many eateries and motel rooms. Livingston, MT is 50 miles to the North and right on I-80. A newish Fairfield Inn & Suites is located there and there are a couple of good steak houses (Montana's Ribs & Chop House).

The Palouse: This agricultural area glows in the spring. I think the favorite vantage point is StepToe Butte south of Spokane.

Upper North Falls @ Silver Falls State Park: waterfalls with not too long of a hike. ~ 30-40 miles ease of Salem, OR.

Glacier Nat'l Park: Going-to-the-Sun RoadP now requires a timed entry ticket. IO think the tickets are good for three days. More info on the link.

Oregon Coast: Sea Stacks near Bandon, OR.

North California Coast: Giant Redwoods just south of the Oregon Border. closest town in Klamath, CA to the North and Trinidad, Mckinleyville, Arcata, & Eureka to the South.

Lassen Volcano Nat'l Park: Along and about a quarter of the way between Redding, CA and Reno, NV on California Hwy 44. I have not visited yet, but will be in June on my way to see the grandkids in Redmond, WA. Hot Springs among other attractions.

Yosemite Nat'l Park/Sequoia and Kings Canyon National Parks: Summer will be packed. Park entry Requires Reservations May 30th - Sept 30th. See the link.