So, I used some miles to buy a couple tickets to south america but unfortunately it's left us with a 12 hour layover in IAH. I have a United club pass but even that I can't imagine sitting in the lounge for 12+ hours.

Is there any recommendations for leaving the airport? Is there good Public transport to take us to someplace interesting. 12 hours should give is plenty of time and we need to be back by 6 to go through security for our flight.

I've never left the airport in IAH but it all looked pretty desolate around the area.