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You can also drive from Marfa down to Presidio, then take the River Road along the Rio Grande to the Park.
It's a long drive and pretty desolate, but is considered one of the best drives in Texas!
Yes, indeed! Try to get the sun behind you on the River Road, late day EB, or early WB, for more colorful mountainsides. The River Road passes thru a scenic valley carved out over eons by the Rio Grande. Greenery along the riverside, then dry desert up into rocky mountains on either side of the Border. It was breathtaking.
The National Park allows outdoor activities like river rafting, mountain climbing, etc.
Don't let that stuff hide the fact that for us senior citizens, the area is great for simple windshield tourism, from the River Road to steep canyons and sky-island forested mountain peaks. Drive slowly and you'll see deer, peccaries, coyotes, roadrunners (my NYC friend exclaimed, "They're real things, not just cartoon characters!), snakes, birds, lizards, butterflies, assorted cactus and pines, and more.
Come by
Sunset Ltd and rent a car. Any of four ways to reach the Park, direct from Alpine, or Alpine-Marfa-Park, Alpine-Marfa-Presidio-River Road-Park, Alpine-Marathon-Park. So one way in, another route out. With each one a geology class excursion.