You could head south on I-5, see Redwood NP, then turn off to hit Yosemite and Death Valley National parks. Then see Sedona, AZ, and go down to Tucson to hit the final stretch to Dallas. On the way back, loop around to see the sights in Utah, then up to Yellowstone before heading home.
There's a lot to see here in the West. Get on Google maps and plug in the places you'd like to see, and find out how they'd fit into your route.
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