That's a great question Alison. I think Americans watch too much TV as well. I have a few shows I watch, but generally watch no more than 5 hours of TV per week.
When I get home from work I rather go to the gym or read a book or magazine, unless a specific show I watch is on. But that's just me and I know I'm an exception rather than the rule since that puts me around 20-25 hours of TV per month; way lower than the average!