X2 on Ft Davis. The star watching party at McDonald Observatory was incredible and for sure worth the trip itself. Balmorrhea SP has a spring fed swimming pool that's a great way to spend a afternoon cooling off.
There is a really nice museum on Sul Ross campus in Alpine, and of course the old military fort.
Right now, it is their rainy season, and with the increased elevation, it is the COOLEST place in Texas. We were there last summer and this was one of the places that my wife said she wouldn't mind coming back to.
If you do go this direction, and are a coffee drinker, there is a coffee roaster in Marfa called Big Bend Coffee Roasters. They sell the products at some of the local stores, but this is the place where they make it. Owner was pretty cool and he gave us about 10 of the old bulk coffee bags that the beans are imported in just by asking.
Courage is the feeling you have right before you fully understand the situation