Go to Scholz's and drink beer with the ghosts of the past. That's J. Frank Dobie settin' over in the corner of the backyard. Mosts there have been there often, some over many decades.
Walk up (or down) Guadelupe. Go to Dirty's. Have another beer or two. Eat a burger.
Go to Cisco's for breakfast. Occasionally the famous and more often the infamous will be there.
There used to be a great model airplance collection in the Tower, now likely hidden away. Even more deeply concealed is the Kinsey Collection of pornography which includes all the great 40s and 50s stuff owned by former Egyptian King Farouk who had money and furrin' agents to purchase and send examples to him in the Diplomatic Bag. Hell of a library of "8 Pagers", classic 'Merkin porno from the Golde Age.
You've got to know somebody, a real somebody for access.