Hi @Theodule! Thanks for reaching out on Conversations!
Several years ago I was on a road trip and passed through Big Bend. I've been itching to go back ever since! Don't know how far you are into planning the hike, but if a loop trail is what you're looking for then I would suggest one of the many loop options involving Emory Peak. Several trails converge in the area, so you can customize the length and terrain variation of your loop experience!