IAH Layover - what to do, where to go, how much time?

post 33 mentions a $99 day rate at the IAH Marriott (between terminals B and C) as a walk up rate (no reservations accepted) but that is from 2013.

That's a possibility if one likes to lie down, watch TV, take a shower, etc. They also have a gym. It's more relaxing than a lounge except no food.

I would explore every terminal but that only takes about 90 minutes. They're all connected now. Before Terminal A was separate and could not be reached without going through security again but that was quite a few years ago.

From Terminal A, one can see the I.M. Pei designed air traffic control tower. Terminal B gates (round satellites) are the original design from the 1970's. Terminal A looks nothing like the original.