Visit the local museum at Sul Ross State University. Excellent. Alpine also has great B-B-Q as well as local Tex-Mex. We will be there this fall! If you like the stars, check out the McDonald Observatory and their star parties--it is usually great--if the weather cooperates. Yes, Lost Alaskan in a very nice RV Park. Have a great trip--the roads are very good--no low bridges.
We have stayed at Portland Fairview RV Park and enjoyed the location and the park. It is easy to get to and near Camping World as well as other shopping centers in the area east of Portland. We took the Light Rail to Portland and enjoyed it. Great parking for free at the Light Rail terminal. Also great access to sites on the Columbia River to the east.
If you are going to Portland, I strongly recommend a few days in Astoria that is on the coast. So many sites, a GREAT museum of the marine and shipping activities along the Columbia River. Visit the Lewis and Clark site near Astoria. Also a good location for a day trip to Cannon Beach, Oregon--see the sea stacks! We would return but it is quiet a drive from San Antonio--maybe next year.
Check out our travels on http://goodsamclub.mytripjournal.com/millingtontravel