Austin, TX to Grand Teton NP

New member here also. Another option to consider is staying on I-25 north from Denver to Casper, WY. Then take HWY 26 west thru Riverton, Dubois and over Togwotee Pass into GTNP. Amazing views of the Wind River Range and the sight of the Tetons as you descend the pass is breathtaking. You may consider a different return route, exiting the East Gate through Cody and south through Thermopolis. In my opinion, Either route is a more scenic drive and has much less truck traffic than I-80. Wind River canyon south of Thermopolis is spectacular. Thermopolis also has natural mineral hot springs that are worth a stop, and a swim. Can't really go wrong with any route to YNP, the drive from Denver north will provide many photo opportunities. Have fun.