You could try what I did last time I was there. Find a great mom and pop eatery and enjoy a real Chinese meal. Combined with the inevitable result, you'll use up 40 hours and lose about 40 lbs of body weight assuming you don't OD on imodium first.
To make the experience a little more relaxing, stop by the Walmart and buy a family pack of TP and double volume of Sodoku before you go out to eat. Throw in a couple scented candles for ambiance and a bag of Peanut M&M's, and when you get sick of Sudoku you can time how quickly a body suffering from who knows what kind of intestinal ailment can process peanuts.
Heck, with 80 hours, you can do the whole thing twice.
Have fun.