Head downtown and find a place called Porky's. Very clean, very fun. Think Coyote Ugly. Typically I'm not fond of the places with all hot girl bartenders because they tend to get hired based on the fact they are hot, not because they are good. Well these girls are hot AND good. Didn't get jumping till around 11 or so. Stay away from Q's. It has free pool, but that's about all.
I heard good things about the bar at the Omni, but we didn't stay there so we didn't check it out.
Also, keep in mind Texas closes at 2am. There might be some waffle houses or something like that open, but when they do last call, they mean last call and there is nothing in the way of after hours hang outs.
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What are you gonna do? Beat me with your Jesus stick?